Trigonometric Identities https://www.youtube.com/watch?v=KlM76clMlD4(1)Conditional trigonometrical identities We have certain trigonometric identities. Like sin2 θ + cos2 θ = 1 and 1 + tan2 θ = sec2 θ etc. Such identities are identities in the sense that they hold for all value of the angles which satisfy the given condition among them and they are called … [Read more...] about Trigonometric Identities