# Thread: [SOLVED] Proving Trig Identities

1. ## [SOLVED] Proving Trig Identities

I'm stuck on proving a couple trig identities.

Ignore question 1, I got it now.
1.
cos2x / 1 + sin2x = 1 - tanx / 1 + tanx

2.
sin2x / 1 - cos2x = 2csc2x - tanx

2. Originally Posted by peekaboos
I'm stuck on proving a couple trig identities.

1.
cos2x / 1 + sin2x = 1 - tanx / 1 + tanx

[snip]
Do it exactly the same way as you were shown here: http://www.mathhelpforum.com/math-he...dentities.html

Note that $\frac{1 - \sin (2x)}{\cos (2x)} = \frac{(1 - \sin (2x)) (1 + \sin (2x))}{\cos (2x) (1 + \sin (2x))} = \, ....$

3. Originally Posted by peekaboos
I'm stuck on proving a couple trig identities.

Ignore question 1, I got it now.
1.
cos2x / 1 + sin2x = 1 - tanx / 1 + tanx

2.
sin2x / 1 - cos2x = 2csc2x - tanx
Try thinking a bit more about your questions before posting them. That way, people won't waste their time answering questions that you've already figured out how to do in the meantime.

4. Alrights, sorry. I get frustrated but then later on I calm down and I can figure it out easier. I don't know, it's just me but I'll keep that in mind.