Wednesday

April 1, 2015

April 1, 2015

Posted by **Anonymous** on Wednesday, February 22, 2012 at 10:25pm.

2sin^2x=sqrt2sinx , [-180,180)

don't how to get x by itself

please help and thank you

- Trig Help (URGENT) -
**Reiny**, Wednesday, February 22, 2012 at 10:57pmlet sinx = y, so you get

2y^2 = √(2y)

square both sides

4y^4 = 2y

4y^4 - 2y = 0

2y(2y^3 - 1) = 0

y = 0 or y^3 = 1/2 --- y = (.5)^(1/3) = appr .7937

if y = 0, then sinx = 0

x = -180°, 0° , 180°

if y = .7937 , then sin x = + .7937 (x must be in I or II)

x = 52.53 or 180-52.53 = 127.47°

but we squared, so our answers MUST be verfied

if x = 180 or -180

LS = 0 , RS = 0 , ✔

if x = 0, ✔

if x = 52.53°

LS = 1.2599 , RS = 1.2599 ✔

if x = 127.47

Ls = 1.2599 , RS = 1.2599 ✔

All 5 answers above are correct

**Answer this Question**

**Related Questions**

Trig (Last URGENT) - sin2x+cosx=0 , [-180,180) = 2sinxcosx+cosx=0 = cosx(2sinx+1...

Trig. - 4cosBeta=1+2cosBeta 2cosBeta=1 cosBeta=1/2 60 degrees +/- 180--is this ...

trig - solve for the equation x sin x= -.35 180<x<270 sin x= .2 90<x<...

Trig - 4. Asked to simplify the expression sin(180−è), Rory volunteered ...

trig - on the same set of axes sketch the graph of f(x)=sin2x and g(x)=2sin x ...

Geometry - Which equation can be used to find the unknow ange measures? The ...

math word problem - the boiling point of water 212 degree f. this is 180 degree ...

trig - Solve exactly over the indicated interval: 2sinx+cscx=3, 0<theta<...

equation complex number - z^4 + 81 = 0 (solve) change it to polar, then take ...

trig - solve exactly over the indicated interval: cot(theta)=0, all real numbers