Friday

November 28, 2014

November 28, 2014

Posted by **Help needed!** on Friday, June 3, 2011 at 12:04am.

2-2cos^2=sinx+1

- Trigonometry -
**Reiny**, Friday, June 3, 2011 at 7:07am2 - 2(1-sin^2x) - sinx - 1 = 0

2sin^2x - sinx -1 = 0

(2sinx + 1 )(sinx-1) = 0

sinx = -1/2 or sinx = 1

x = 210° or 330° or 90°

or

x = 7π/6 , 11π/6, or π/2

- Trigonometry -
**sunny**, Wednesday, August 8, 2012 at 2:43pmjkjkkllklkgjsin cos

**Answer this Question**

**Related Questions**

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

Math-trigonometry - Several questions from my homework, any are appreciated. ...

Math (Calc) - Find all solutions to the following equation on the interval 0<...

pre cal - Find all solutions in the interval[0,2pi),cos x/2-sinx=0

Advanced Functions - Determine the solutions for: (cos x)/(1 + sinx) + (1 + sinx...

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

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

Trigonometry - Find all solutions of the equation in the interval [0,2pi] ...

Math - Can I please get some help on these questions: 1. How many solutions does...

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