If f(x) = sin 2x + cos x, find f(/2).

Expert Answers
hala718 eNotes educator| Certified Educator

f(x) = sin2x + cosx

We need to find f(pi/2)

We will substitute with x= pi/2

==> f(pi/2) = sin(2*pi/2) + cos (pi/2)

                   = sin(pi) + cos(pi/2)

                   = 0 + 0 = 0

Then the value of f(pi/2) = 0