Verify the following identity and use it to give another proof of the formula (sin x) =
Chapter 3, Problem 55(choose chapter or problem)
Verify the following identity and use it to give another proof of the formula (sin x) = cos x: sin(x + h) sin x = 2 cos x + 1 2h sin 1 2h Hint: Use the addition formula to prove that sin(a + b) sin(a b) = 2 cos a sin b.
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