Question

If y = 1 and y = cos x , list the values of x where 0 degrees <= x <= 360 degrees to make these statements true.

Answer 1

90°

Explanation:

cosx = y=1

Therefore cosx =1

For cosx= 1

x= 90°, 450°, 810° ... etc.

Now 0° ≤ x ≤ 360°

The only value that satisfies both relations is 90°

Therefore, x= 90°