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

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

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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

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