Sunday

November 23, 2014

November 23, 2014

Posted by **Anonymous** on Monday, November 2, 2009 at 12:04pm.

a) cos2x = 1 - 2sin^2x

b) cos2x = 2cos^2x - 1

- advanced functions -
**bobpursley**, Monday, November 2, 2009 at 1:01pmsin^2x+ cos^2x=1

cos^2x+ sin^2x-2sin^2x=1-2sin^2x

cos^2x-sin^2x=1-2sin^2x

cos(2x)=1-2sin^2x

**Answer this Question**

**Related Questions**

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

math - the problem is 2cos^2x + sinx-1=0 the directions are to "use an identity ...

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

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

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

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

Math - Trig - Double Angles - Prove: sin2x / 1 - cos2x = cotx My Attempt: LS: = ...

gr 12. advanced functions - Trig identity Prove: cos2x tan(pie/4 - x...

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

Precalculus - Please help!!!!!!!!!!! Find all solutions to the equation in the ...