Question

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Prove that :
$ \rm{sin 4\theta = 4 sin\theta cos3\theta – 4 cos \theta sin3 \theta}$

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Answer 1

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1) Cos2A = 2 Cos²A - 1

2) Cos2A = 1 - 2Sin²A

3) tan 2A = 2 tanA/ (1 - tan²A)

4) Sin2A = 2 tan A / (1+ tan²A)

5) Cos2A = (1 - tan²A) /( 1 + tan²A)