Question

Find all solutions to the equation.

7 sin2x - 14 sin x + 2 = -5

Answer 1

sin^2 x

Answer 2

u =sinx
7u^2-14u+7=0
u^2-2U+1=0
(u-1)(u-1)=0
root: 1
sinx =1
when x=pi/2, 5pi/2, 9pi/2, ...

Answer 3

those are the three solutions ? @P0sitr0n

Answer 4

well, if there is no interval specified, theres infinitely many solutions since sinx is a cyclic function, like it repeats itself