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anonymous
 4 years ago
tan^2 x = 1cos2x/ 1+ cos2x true or false?
anonymous
 4 years ago
tan^2 x = 1cos2x/ 1+ cos2x true or false?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0That would be true. It' an identity.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0It's not an identity. Does tan^2x = 1(cos2x/1)? I'm certain it doesn't. It does, however, equal to (1cos2x)/2. This is an example of a halfangle identity.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[\frac{ 1\cos 2x }{ 1+\cos 2x }=\frac{ 1(12\sin^2x) }{ 1+(2\cos^2x1) }=\frac{ 2\sin^2x }{2\cos^2x }=\tan^2x\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0you guys are confusting me 0.o true or no?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0the first i did was to use the double angle formula for sine and cosine. then it was simplified, then since the ratio of sine and cosine is tangent, then the next step is obvious.
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