rainforest321 rainforest321

23-12-2016
Mathematics

contestada

prove sin^2 theta-sin^2 theta is sin tetha sin 3 theta

how to prove..pls help!! thanksss

prove sin2 thetasin2 theta is sin tetha sin 3 thetahow to provepls help thanksss class=

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evreddy324 evreddy324

23-12-2016

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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