Friday

January 30, 2015

January 30, 2015

Posted by **Argelia** on Tuesday, February 12, 2013 at 10:52pm.

2sin^2x-1=0

- pre-cal -
**Reiny**, Wednesday, February 13, 2013 at 12:03am2sin^2x-1=0

sin^2 x = 1/2

sinx = ±1/√2

I know sin 45° = 1/√2 or sin π/4 = 1/√2

because of the ± , our angle could be in any of the 4 quadrants

so x = π/4 , 3π/4, 5π/4 , 7π/4

**Answer this Question**

**Related Questions**

pre-cal - solve for all values in [0,2pie) 2cos^2x-5sinx+1=0

pre-cal - show solution solve. 2sin^(2)x=2+cosx

Pre Cal - Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My ...

Pre Cal. - So I posted these...but no one answered them. Are they right? Solve ...

pre-cal - 5 t values used to graph (called key pts or inflection pts) and ...

Pre-Cal - How do you find the number of solutions(not all the answers) for each ...

trig - Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X...

Pre Cal - simplify the expression 2sin^2 t + cos^2 t-2

pre cal - find the exact value of tan(2sin-1 3/5)

Math pre cal - prove the following identity cos^4X - sin^4X = 1-2sin^2X