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: 14

Answer

$\dfrac{\cos x\sec x}{\cot x}=\tan x$

Work Step by Step

$\dfrac{\cos x\sec x}{\cot x}$ Substitute $\sec x$ with $\dfrac{1}{\cos x}$ and $\cot x$ with $\dfrac{\cos x}{\sin x}$ and simplify: $\dfrac{\cos x\sec x}{\cot x}=\dfrac{\cos x\Big(\dfrac{1}{\cos x}\Big)}{\dfrac{\cos x}{\sin x}}=\dfrac{1}{\dfrac{\cos x}{\sin x}}=\dfrac{\sin x}{\cos x}=\tan x$
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