Sorry for troubling you guys but i keep coming up with an extra 3cosX

Prove:

3sinxtanx=8is the same as3cos^2x+8cosx-3=0

Any help would be great.

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- Apr 2nd 2009, 07:10 AMDominic O'LProve the following Trig Identity
Sorry for troubling you guys but i keep coming up with an extra 3cos

**X**

**Prove:**

3sin**x**tan**x=**8*is the same as*3cos^2**x**+8cos**x**-3=0

Any help would be great. - Apr 2nd 2009, 07:38 AMe^(i*pi)
- Apr 2nd 2009, 07:42 AMmasters
- Apr 2nd 2009, 07:50 AMDominic O'L
Thank you ever so much, i'm in the process of working through maths past papers so your help is much appreciated, AS exam only a month and a half away(Worried).

- Apr 2nd 2009, 08:56 AMSoroban
Hello, Dominic O'L

Quote:

Prove: . is the same as

We have: .

. .

Therefore: .