find the identical expression for cosx(cscx-tanx)

Mathematics
Tutor: None Selected Time limit: 1 Day

I know this is an identity and it's on my homework assignment. My answer choices are

A. tanx - cosx

B. cos - sinx

C. sinx

D. secx 

May 6th, 2015

Answer is D. secx 

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May 6th, 2015

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