I am attempting to study for my final and there are a few things that I was getting stuck on that I wanted to see if I could get help one.
I had one problem thant was:
prove: cos 2X = (1- tan^2 X/ 1+tan^2 X)
I then substitued with the identities and got
(1- (sin^2X/cos^2X))/(1+ (sin^2X/cos^2X))
I then replaced them with another identiy and got
(1- ((1-cos^2X)/(1+ sin^2X)))/(1+ ((1-cos^2X)/(1-sin^2X))
Then I got stuck. If anyone could help let me know.... thanks[/img]
I had one problem thant was:
prove: cos 2X = (1- tan^2 X/ 1+tan^2 X)
I then substitued with the identities and got
(1- (sin^2X/cos^2X))/(1+ (sin^2X/cos^2X))
I then replaced them with another identiy and got
(1- ((1-cos^2X)/(1+ sin^2X)))/(1+ ((1-cos^2X)/(1-sin^2X))
Then I got stuck. If anyone could help let me know.... thanks[/img]