Question

Which of the following is a solution to sinx+cos(3x)=1

a. 1
b. pi/2
c. pi/4
d. 0.927

Answer 1

b. pi/2

Explanation:

Try each option in turn:

x = 1:

sin 1 + cos 3 = -0.14

x = pi/2:

sin pi/2 + cos 3pi/2 = 1