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...