Friday

January 30, 2015

January 30, 2015

Posted by **Tyler** on Thursday, April 15, 2010 at 5:12am.

sin 2x/sinx - cos2x/cosx = secx

- Pre Calculus -
**Reiny**, Thursday, April 15, 2010 at 8:40amUse sin 2x = 2sinxcosx and

cos 2x = 2cos^2x - 1

in the left side, it comes apart nicely

**Answer this Question**

**Related Questions**

Pre Calculus - Having trouble verifying this identity... cscxtanx + secx= 2cosx ...

Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...

Precalculus/Trig - I can't seem to prove these trig identities and would really ...

Pre-Calculus - How do you verify: 1.) sinxcosx+sinx^3secx=tanx 2.) (secx+tanx)/(...

Pre Calculus - Establish the identity (cosx/2-sinx/2)^2=1-sin x

Pre-Calculus - How can this identity be proved/verified? cscx-sinx=1/(secxtanx) ...

Math - Pre- Clac - Prove that each of these equations is an identity. A) (1 + ...

Trigonometry - Prove the following trigonometric identities. please give a ...

drwls - My previous question: Verify that (secx/sinx)*(cotx/cscx)=cscx is an ...

Trig - If secx = 8 and -pi/2 < x < 0, find the exact value of sin2x Use ...