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TRIG Identities, Gr. 12:
Prove:
cot4x=1-tan^2x/2tan2x
12 years ago

Answers

Steve
just apply the double-angle formula for tan(2x) and take the reciprocal
12 years ago
Josh
okay, thank you, would that still apply if it was cot4x=1-tan^2(2x)/2tan2x? because ive got the right side for this one but the cot4x is throwing me off, how would you solve that side?
12 years ago
Steve
you are exactly right

tan(4x) = 2tan2x/(1-tan^2(2x))
so, cot(4x) is the reciprocal, as needed.
12 years ago

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