Selina Concise Mathematics Class 10 ICSE Solutions Trigonometrical Identities

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

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

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

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Question 12.
Without using trigonometrical tables, evaluate:
cosec² 57° – tan²33° + cos 44° cosec46° – $\sqrt{2}$ cos45° – tan²60°
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Trigonometrical Identities Exercise 21D – Selina Concise Mathematics Class 10 ICSE Solutions

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

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Question 10.
$\frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}$
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To prove that : $\frac{\cot A-1}{2-\sec ^{2} A}=\frac{\cot A}{1+\tan A}$

Hence proved.

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Question 17.
Evaluate without using trigonometric tables,
sin² 28° + sin² 62° + tan² 38° – cot² 52° + $\frac{1}{4}$ sec² 30°
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