Question

CosA.cos2A. = 1/4 sin4A. CosecA prove that.

Answer 1

Answer:

We can write 1/4 sin(4a)sec(a) as:

1/4 sin(4a)sec(a)=1/4*2sin(2a)*cos(2a)*1/(cos(a))=1/2*2sin(a)*cos(a)*cos(2a)*1/(cos(a))=sin(a)*cos(2a).

Answer 2

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