Verify the following identity and use it to give another proof of the formula (sin x)' =
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Verify the following identity and use it to give another proof of the formula (sin x)' = cos x:
Use the addition formula for sine to prove that sin(a + b) − sin(a − b) = 2 cos a sin b.
Transcribed Image Text:
2 cos (x + h) sin( sin(x + h) sin x = 2 cos
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