Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 7 - Section 7.1 - Trigonometric Identities - 7.1 Exercises - Page 543: 34

Answer

$\dfrac{\cot x\sec x}{\csc x}=1$

Work Step by Step

$\dfrac{\cot x\sec x}{\csc x}=1$ Substitute $\cot x$ with $\dfrac{\cos x}{\sin x}$, $\sec x$ with $\dfrac{1}{\cos x}$ and $\csc x$ with $\dfrac{1}{\sin x}$. Then simplify: $\dfrac{\Big(\dfrac{\cos x}{\sin x}\Big)\Big(\dfrac{1}{\cos x}\Big)}{\Big(\dfrac{1}{\sin x}\Big)}=1$ $\rightarrow$ $\dfrac{\Big(\dfrac{1}{\sin x}\Big)}{\Big(\dfrac{1}{\sin x}\Big)}=1$ $\rightarrow$ $1=1$
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