## Selina Concise Mathematics Class 10 ICSE Solutions Trigonometrical Identities (Including Trigonometrical Ratios of Complementary Angles and Use of Four Figure Trigonometrical Tables)

**Selina Publishers Concise Mathematics Class 10 ICSE Solutions Chapter 21 Trigonometrical Identities (Including Trigonometrical Ratios of Complementary Angles and Use of Four Figure Trigonometrical Tables)**

### Trigonometrical Identities Exercise 21A – Selina Concise Mathematics Class 10 ICSE Solutions

**Question 1.**

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**Question 2.**

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**Question 3.**

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**Question 4.**

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**Question 5.**

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**Question 6.**

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**Question 7.**

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**Question 8.**

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**Question 9.**

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**Question 10.**

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**Question 11.**

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**Question 12.**

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**Question 13.**

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**Question 14.**

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**Question 15.**

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**Question 16.**

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**Question 17.**

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**Question 18.**

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**Question 19.**

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**Question 20.**

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**Question 21.**

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**Question 22.**

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**Question 23.**

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**Question 24.**

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**Question 25.**

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**Question 26.**

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**Question 27.**

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**Question 28.**

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**Question 29.**

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**Question 30.**

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**Question 31.**

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**Question 32.**

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**Question 33.**

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**Question 34.**

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**Question 35.**

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**Question 36.**

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**Question 37.**

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**Question 38.**

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**Question 39.**

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**Question 40.**

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**Question 41.**

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**Question 42.**

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**Question 43.**

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**Question 44.**

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**Question 45.**

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**Question 46.**

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**Question 47.**

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**Question 48.**

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### Trigonometrical Identities Exercise 21B – Selina Concise Mathematics Class 10 ICSE Solutions

**Question 1.**

**Solution:**

**Question 2.**

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**Question 3.**

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**Question 4.**

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**Question 5.**

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**Question 6.**

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**Question 7.**

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### Trigonometrical Identities Exercise 21C – Selina Concise Mathematics Class 10 ICSE Solutions

**Question 1.**

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**Question 2.**

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**Question 3.**

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**Question 4.**

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**Question 5.**

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**Question 6.**

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**Question 7.**

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**Question 8.**

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**Question 9.**

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**Question 10.**

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**Question 11.**

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**Question 12. **Without using trigonometrical tables, evaluate:

cosec

^{2}57° – tan

^{2}33° + cos 44° cosec46° – cos45° – tan

^{2}60°

**Solution:**

### Trigonometrical Identities Exercise 21D – Selina Concise Mathematics Class 10 ICSE Solutions

**Question 1.**

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**Question 2.**

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**Question 3.**

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**Question 4.**

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**Question 5.**

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**Question 6.**

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### Trigonometrical Identities Exercise 21E – Selina Concise Mathematics Class 10 ICSE Solutions

**Question 1.**

**Solution:**

**Question 2.**

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**Question 3.**

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**Question 4.**

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**Question 5.**

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**Question 6.**

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**Question 7.**

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**Question 8.**

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**Question 9.**

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**Question 10.**

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To prove that :

Hence proved.

**Question 11.**

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**Question 12.**

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**Question 13.**

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**Question 14.**

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**Question 15.**

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**Question 16.**

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**Question 17.**

Evaluate without using trigonometric tables,

sin^{2} 28° + sin^{2} 62° + tan^{2} 38° – cot^{2} 52° + sec^{2} 30°

**Solution:**

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