. Proof of (cos x) = - sin x Use the definition of t dx and the trigonometric identity cos(x + h) = cos x cos h sin x sin h to prove that (cos x) dx = -sin x.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 71E
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Use the definition of the derivative
and the trigonometric identity

. Proof of (cos x) = - sin x Use the definition of t
dx
and the trigonometric identity
cos(x + h) = cos x cos h
sin x sin h
to prove that (cos x)
dx
= -sin x.
Transcribed Image Text:. Proof of (cos x) = - sin x Use the definition of t dx and the trigonometric identity cos(x + h) = cos x cos h sin x sin h to prove that (cos x) dx = -sin x.
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