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Prove sin(a+b)sin(a-b)=sin^2a-sin^2b

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Prove sin(a+b)sin(a-b)=sin^2a-sin^2b

S
Svtuition

43 Views • Mar 04, 2016

Description

If you know that sin (a+b) will sina cosb + cosa sinb and sin(a-b) will be sina cosb - cosa sinb, this to prove the equation will not be difficult. You should know also cos^2 = (1-sin^2)

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