Thursday

December 18, 2014

December 18, 2014

Posted by **eve** on Saturday, May 5, 2012 at 1:11pm.

cosx - cos(2x) =

- math -
**MathMate**, Sunday, May 6, 2012 at 8:12amuse the identity

cos(2x)=cos²(x)-sin²(x)

if it is an equation, we will need something on the right hand side.

**Answer this Question**

**Related Questions**

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

pre-calc - Solve: cos(2x-180) - sin(x-90)=0 my work: cos2xcos180 + sin2xsin180= ...

Trig - prove the identity (sinX)^6 +(cosX)^6= 1 - 3(sinX)^2 (cosX)^2 sinX^6= ...

Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...

Math - Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/...

RESPONSE to PreCalc Question - h t t p : / / w w w . j i s k h a . c o m / d i s...

Maths - Solve this equation fo rx in the interval 0<=x<=360 3sinxtanx=8 I ...

Math - Explain how to do this with steps please. 1. Simplify cos(x-y)+cos(x+y)/...

Math - trig - Determine the general solution of 8 cos^2x - 4cosx - 1 =0 (8cos^2x...

Math 12 - Simplify #1: cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/sinx+...