Use the definition of the derivative and the trigonometric identity cos (x + h) = cos x

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Use the definition of the derivative and the trigonometric identity

cos (x + h) = cos x cos h - sin x sin h

to prove that d/dx (cos x) = -sin x.

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Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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Question Posted: Feb 08, 2019 12:26 PM

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Use the definition of the derivative and the trigonometric identity cos (x + h) = cos x

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d dx cos x lim h0 cosx h h ...View the full answer

Calculus Early Transcendentals

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