Question

the value of x when cos2x=sinx is

Answer 1

Step-by-step explanation:

We know that cos 2x = 1 - 2*(sin x)^2

we have sin x = 1/3

=> cos 2x = 1 - 2*(1/3)^2

=> cos 2x = 1 - 2*(1/9)

=> cos 2x = (9 - 2)/9

=> cos 2x = 7/9