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S_A_V [24]
3 years ago
12

Prove sin^2 theta-sin^2 theta is sin tetha sin 3 thetahow to prove..pls help!! thanksss

Mathematics
1 answer:
Artemon [7]3 years ago
3 0
Simply you can substitute theta=45 degrees (or any angle,not zero) in left hand side and right hand side.

or 

using a^2 - b^2 =(a+b)(a-b)

= sin(2x+x)sin(2x-x)
= sin 3x sin x
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