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OpenStudy (anonymous):
Verify the identity. sin (x + y) - sin (x - y) = 2 cos x sin y
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hartnn (hartnn):
do you know the formula for sin(A+B) =... ?
OpenStudy (anonymous):
Sin(a+b) = sin a . cos b + Cos a. Sin b sin (a-b) = sin a . cos b - Cos a. Sin b
Parth (parthkohli):
Yeah, that's pretty much it ^
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