a) sec2(x) = [sec^2(x)]/[2 - sec^2(x)] b) sec2(x) = [1 + tan^2(x)]/[1 - tan^2(x)] c) [cot(x) - tan(x)]/[cot(x) + tan(x)] = cos2(x)
for these try using sec^2(x) = 1 + tan^2(x) or convert everything to sin(x) and cos(x) first
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