Find an angle x where sin (x) = cos (x)

45 degrees

Step-by-step explanation:

sin (x) = cos (x)

Divide each side by cos x

sinx/cos x = cos x/cos x

tan x = 1

Take the arctan of each side

arctan (tan x) = arctan (1)

x = 45 degrees + 360 n

x = 225 + 360 n

where n is an integer

We only have to choose 1 since it says choose an angle