Homework Help

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

user profile pic

swavers | Student, Grade 11 | eNoter

Posted April 16, 2011 at 12:04 PM via web

dislike 1 like

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

1 Answer | Add Yours

Top Answer

user profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted April 16, 2011 at 12:08 PM (Answer #1)

dislike 0 like

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

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes