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OpenStudy (anonymous):
tan2x=____ A. tan x/1+tan^2 x B. 2tan x/1+tan^2 x C. 2tan x/1-tan^2 x D. tan x/1-tan^2 x
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OpenStudy (zehanz):
You could start with: tan2x=sin2x/cos2x
OpenStudy (anonymous):
tan2x=sin2x/cos2x is an ID right because they are equal right?
OpenStudy (zehanz):
It is because tanx is defined as sinx/cosx
OpenStudy (anonymous):
cool
OpenStudy (anonymous):
I think the answers C because they are equal
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OpenStudy (zehanz):
How do you know they are equal?
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