Question

if sin3teta = cos2teta then find cot 5 teta /2
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Answer 1

Step-by-step explanation:

sin 3theta = cos (90° - 2theta)

sin 3 theta = sin 2 theta

sin 3theta - 2theta form

=2 cos (3 theta+2theta) /2 . sin (3 theta-2theta) /2

=2 cos 5theta /2 . sin 1 theta/2

= cot 5 theta / 2

hence proved