Question

ce
Write sina in terms of
Cos
2A​

Answer 1

Answer:

They are called this because they involve trigonometric functions of double angles, i.e. sin 2A, cos 2A and tan 2A. and this is our second double angle formula. Similarly tan(A + A) = tanA + tanA 1 − tanAtanA so that tan 2A = 2 tanA 1 − tan2 A These three double angle formulae should be learnt.

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Answer 2

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