Sunday

April 20, 2014

April 20, 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?

**Related Questions**

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

math - show that the equation 2x-1-sinx=0 has exactly one real root. sin x = 2x-...

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

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

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

Algebra HELP - Can someone check my answers? Solve for m: m + 6 = 3(2m - 4) a.4 ...

Math - Solve each equation for all real values of x. 7.) 3 cos 2x - 5 cos x = 1 ...

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

solution of an equation - can someone please give me an example of a solution of...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...