Wednesday

March 4, 2015

March 4, 2015

Posted by **Hayli** on Thursday, November 4, 2010 at 11:15pm.

2-cos^2x=4sin^2(1/2x)

- PRE CALC PLEASE HELP!!!!!!!! -
**Reiny**, Friday, November 5, 2010 at 8:40am2 - (1 - 2sin^2 (x/2) = 4sin^2 (x/2)

1 = 2 sin^2 (x/2)

sin^2 (x/2) = 1/2

sin (x/2) = 1/√2

x/2 = π/4 or x/2 = 3π/4

then x = π/2 or x = 3π/2

**Answer this Question**

**Related Questions**

trig - I need to find all solutions of the given equations for the indicated ...

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

Pre-Calc/Math - Use factoring, the quadratic formula, or identities to solve cos...

Math (Pre-Calc) - Find all the solutions of the equation in the interval {o,2pi...

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

Pre-Calc - Find all solutions of the equation in the interval [0, 2pi). Show all...

Math - cos x = -0.6 , 0 <= theta <= 2pi Use inverse trigonometric ...

Precalculus II - Find exactly all solutions in [0,2pi) to 4sin(x)cos(x) = 1

pre calc - Find all solutions of the equation 3sin^2 x -7sin x +2 = 0 in the ...

Pre-Calculus - cos^2(x) + sin(x) = 1 - Find all solutions in the interval [0, ...