November 12, 1997

Sec 2.5 – General Differentiation . Differentiation of Sine & CosineName: (1) Let’s try to prove the derivative of the function f x =sin x using the definition of the derivative. f' x = lim h→0 sin x+h -sin x h . We could use the sum and difference trig identities to substitute . sin x+h = sin x cos h +cos x sin h . f' x = lim h→0 sin x cos h +cos x sin h -sin x h ................
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