Originally Posted by

**ramzel** I just get confused by something very basic,

Imagine we got cos 2x = something

And the angle lies between 0 and 180

so to solve it, i gotta multiply the range by 2 right ?

I mean when the equation gets complex, how to do these kind of things...

Do i solve for 2x first then divide, or find x and find it in its quadrant, sorry, i dont really get it...

like i had this number sin2x = 1/2

range was -180 to 180

so you solve for 2x which gives you 30

so x = 15 right,

muliplying the range gives me - 360 to 360

the answer is 15 75 -165 -105

can someone explain it to me, im a bit confused...