Find F(pi/4)

Question

let f(x)= sin (2x)

find f(pi/4)

Answer 1

replace x by pi/4 and simplify the function

 

f(pi/4)= sin(2*(pi/4))

         = sin(pi/2)

         = 1

Answer 2

f(x) = sin(2x)

 

f(pi/4) = sin(2*pi/4) = sin (pi/2) = 1