Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 14 - Trigonometric Identities and Equations - 14-1 Trigonometric Identities - Practice and Problem-Solving Exercises: 8


$\sin{\theta} \cot{\theta}=\cos\theta$ Refer to the step-by-step part below for the proof.

Work Step by Step

Work on the left hand side: Step 1: By definition, replace $\cot\theta$ with $\frac{\cos\theta}{\sin\theta}$ Hence, $\sin\theta\cot\theta=\sin\theta\times\frac{\cos\theta}{\sin\theta}$ Step 2: Cancel out $\sin\theta$ Hence, $\sin\theta\cot\theta=\cos\theta$
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