Prove the identity: COSX cotx secx tanx = -cos²x.cot²x

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Transcribed Image Text:Ms. Whodunit needs $15 000 to go on her dream vacation in four years. How much does she need to invest now in an account earning 5.5% annual interest compounded semi-annually?
Prove the identity:
COSX
cotx
secx tanx
= -cos²x.cot²x
Transcribed Image Text:Prove the identity: COSX cotx secx tanx = -cos²x.cot²x
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