# The Derivatives of $\sin x$ and $\cos x$

by Norman Schaumberger (Bronx Community College)

College Mathematics Journal
March, 1984

Subject classification(s): Calculus | Single Variable Calculus
Applicable Course(s): 3.1 Mainstream Calculus I

Simple proofs of the formulas for the derivatives of $\sin x$ and $\cos x$ when $x$ is acute

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