Tuesday

November 25, 2014

November 25, 2014

Posted by **Daisy** on Tuesday, December 4, 2012 at 5:11pm.

- Math -
**Steve**, Tuesday, December 4, 2012 at 6:50pmsince sin^2 = 1-cos^2,

1-cos^2 = -2 + 2cos

cos^2 + 2cos - 3 = 0

(cos+3)(cos-1) = 0

cos=1, so x = 0,2pi,4pi,...

why not -3?

**Answer this Question**

**Related Questions**

math - Solve 2cosx-sin^x +2 =0 for all real values of x

Math - Find all real solutions of the equation. (Enter your answers as a comma-...

math - tanx+secx=2cosx (sinx/cosx)+ (1/cosx)=2cosx (sinx+1)/cosx =2cosx ...

Math - Solving for Trig Equations - For the following equation, why cannot I not...

college algebra - Find all real solutions of the equation. (Enter your answers ...

Math, please help - Which of the following are trigonometric identities? (Can be...

math - Ok, so when you are solving an equation, and you have an answer such as ...

math - Prove that for all real values of a, b, t (theta): (a * cos t + b * sin t...

Trigonometic - Solving Trigonometic Equations solve for x and give the answers ...

Math - Find the limit of (2cosx+3cosx-2)/(2cosx-1)as x tends to pi/3.