SOLUTION: a.(1-tan^2u)/(1+tan^2u)=cos(2u) I think this is a half angle identity?verify the identity. b. compare the graphs of y1=(1-tan^2u)/(1+tan^2u) and y2=cos(2u)

Question 101196: a.(1-tan^2u)/(1+tan^2u)=cos(2u)
I think this is a half angle identity?verify the identity.

b. compare the graphs of y1=(1-tan^2u)/(1+tan^2u) and y2=cos(2u)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
verify the identity.
a.(1-tan^2u)/(1+tan^2u)=cos(2u)
(1-tan^2u)/sec^2u = cos^2u-sin^2u
[1/sec^2u] - [tan^2u/sec^2u] = cos^2u-sin^2u
cos^2u - sin^2u = cos^2u - sin^2u
=================================

b. compare the graphs of y1=(1-tan^2u)/(1+tan^2u) and y2=cos(2u)
---------
Can't do that on this site.
--------------------------------------
Cheers,
Stan H.
RELATED QUESTIONS
Find the exact values of sin 2u , Cos 2u, and tan 2u using double angle formulas. 1.... (answered by stanbon)

Find the exact values of sin(2u), cos(2u), and tan(2u) using the double-angle formulas. (answered by Boreal,MathTherapy,Alan3354)

Find the exact values of sin(2u),cos(2u),tan(2u)using the half-angle formulas. sin u =... (answered by greenestamps,ikleyn)

please help me solve: 4tan^2u-1=... (answered by KMST)

Find the exact values of sin 2u,cos 2u, and tan 2u using the double-angle formulas. tan... (answered by Alan3354)

Find the exact values of sin(2u), cos(2u), and tan(2u) using the double-angle formulas.... (answered by lwsshak3)

Verify the identity. cos 4u = cos^2 2u - sin^2... (answered by Alan3354)

Verify the identity. Please help cos 4u = cos^2 2u - sin^2... (answered by greenestamps)

Find the exact value of sin 2u, cos 2u, and tan 2u given that the terminal sideof angle u (answered by lwsshak3)