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Prove sin^2 theta-sin^2 theta is sin tetha sin 3 theta how to prove..pls help!! thanksss
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Nov 3, 2017
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Prove sin^2 theta-sin^2 theta is sin tetha sin 3 theta
how to prove..pls help!! thanksss
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Tani
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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
Drolex
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Nov 7, 2017
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