Question

If f(B)=cos2B+2sinB, the numerical value of f(pi/6) is what?

Answer 1

plug in pi/6 into B

Answer 2

cos(2*pi/6)+2sin(2*pi/6)

Answer 3

that gives you cos(pi/3)+2sin(pi/3)

Answer 4

now what is the sin and cos of pi/3?