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

youtube 28.05.2013

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). Watch more maths videos at http://mathematics.svtuition.org/

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

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