Question #254174

graph the expression 1-tan^2x/1+tan^2x, and make a conjecture about another expression that is equivalent to another.


1
Expert's answer
2021-10-21T10:19:07-0400

Let us graph the function y=1tan2x1+tan2x:y=\frac{1-\tan^2x}{1+\tan^2x}:



It follows from the graph that y=cos(2x).y=\cos(2x).

Indeed, 1tan2x1+tan2x=1tan2x1cos2x=cos2x(1sin2xcos2x)=cos2xsin2x=cos(2x).\frac{1-\tan^2x}{1+\tan^2x} =\frac{1-\tan^2x}{\frac{1}{\cos^2 x}} =\cos^2x(1-\frac{\sin^2x}{\cos^2x}) =\cos^2x-\sin^2 x=\cos(2x).


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!
LATEST TUTORIALS
APPROVED BY CLIENTS