A student was asked to prove the trigonometric identity tan-x+cot-x=2csc x. Which of the following could be the first step in proving the identity? I. II. 1– cosx sin x 1-cosx sin x sin x + sin x 1- cos x 1-cos x sin x 1cosx 2cscx = 2cscx 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 72E
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Question
a
b
"c
с
d
I only
Il only
I and II only
I, II, and III
Transcribed Image Text:a b "c с d I only Il only I and II only I, II, and III
A student was asked to prove the trigonometric identity tan-x+cot-
n=1/x + cot=1/x =
ot=1/x = 2cs
identity?
1.
II.
III.
1- cos x
sin x
1- cos x
sin x
sin x
1+ cos x
+
+
sin x
1- cos x
1- cos x
sin x
1- cos x
sinx
2cScx
2 csc x
= 2csc x
= 2cscx. Which of the following could be the first step in proving the
Transcribed Image Text:A student was asked to prove the trigonometric identity tan-x+cot- n=1/x + cot=1/x = ot=1/x = 2cs identity? 1. II. III. 1- cos x sin x 1- cos x sin x sin x 1+ cos x + + sin x 1- cos x 1- cos x sin x 1- cos x sinx 2cScx 2 csc x = 2csc x = 2cscx. Which of the following could be the first step in proving the
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