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OpenStudy (anonymous):
Establish the identity: (1-cosѲ)/(1+cosѲ)=(cscѲ-cotѲ)^2
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OpenStudy (ash2326):
(1-cos theta)/(1+cos theta) multiply numerator and denominator by 1-cos theta (1-cos theta)^2/(1-cos^2 theta) (1+cos^2 theta-2cos theta)/sin^2 (theta) 1/sin theta=cosec theta cosec^2 theta+cot^2 theta-2cosec theta*cot theta (cosec theta-cot theta)^2
OpenStudy (anonymous):
Thank you!!
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