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OpenStudy (anonymous):
Establish the Identity: cot^2 (θ/2) = (secθ +1)/(secθ -1)
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OpenStudy (anonymous):
(secθ +1)/(secθ -1) = (1/cosθ +1)/(1/cosθ -1) = (1+cosθ)/(1-cos θ) = (2cos^2θ/2 )/(2sin^2θ/2) = cot^2θ/2 [proved]
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