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OpenStudy (lynfran):
Help!! Please.. Prove that (1-tan^2(pi/4 - theta)) divided by (1 + tan^2(pi/4 - theta)) = 2sin(theta)cos(theta)
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OpenStudy (shiraz14):
Use the substitutions: tan^2(theta) +1 = sec^2(theta) and 1/cos(theta) = sec(theta) to prove this identity.
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