If cos2x-sinx=0 , then which of the following values could be sinx?

a) -1
b) -1/2
c) 0
d) 1

A) -1

Step-by-step explanation:

cos2x - sinx = 1 - 2 sin²x - sinx = 0

2 sin²x + sinx -1 = 0

(sinx + 1) (2sinx - 1) = 0

sinx = -1 or sinx = 1/2

The answer is c

Step-by-step explanation:

if you add the first 2 numbers squared out of the 3 on i and ii and divide the by the 3rd number on i and ii you get the last number which means you did it correctly. Demonstration

3,4,5 3×3=9 4×4=16 9+16=25 25÷5=5 that is the correct formula to answers thrs types of questions :)