Friday

November 28, 2014

November 28, 2014

Posted by **Anonymous** on Monday, November 2, 2009 at 3:45pm.

cos2x = 2cos^2x - 1

**Answer this Question**

**Related Questions**

advanced functions - Use the Pythagorean identity to show that the double angle ...

trigonometry - Use a compound angle formula for cosine to show that cos2x = cos^...

trig or geom - i have to use pythagorean theorem to find the leg-measure of x. ...

Trigonometry - Need help solving problems using the Trigonometric Identities: ...

Pre-Calculus - Find all solutions to the equation in the interval [0, 2pi) cos4x...

trig - Use the double angle formula to verify the identity cotxsin2x=1+cos2x

trig - A coil of wire rotating in a magnetic field induces a coltage E=20sin((...

Trig - If sinx = 1/4 Find the exact value of cos2x I used the formula for double...

Advanced Functions - Determine all solutions in the interval x is all real ...

Trig - If cosx = 10/19 an pi < x < 2pi, find the exact value of cos x/2 ...