What is the value of x?

sin 49° = cos x

Answer: x=41

Sin, cos and tan are part of the trigonometric function. Sin is calculated from opposite/hypotenuse, while cos is calculated from adjacent/hypotenuse.

There is some formula that can be derived from the equation. One of them is sin (90-x) = cos x

If you use it, the calculation would be:

sin 49° = cos x

sin 49 = sin (90-x)

49 = 90-x

x = 90-49 = 41