Question

If f(x)=sin(2x) then f(π/4) =

Answer 1

Have you considered substituting the value pi/4 into the function definition?

Answer 2

f(x)=sin(2x)
Substituting x=π/4, we find
\[f(π/4) =\sin(2\times \frac{\pi}{4})=\sin( \frac{\pi}{2})=1\]
Thus
\[f(π/4) =1\]

Answer 3

{sigh} I guess we'll never know...

Answer 4

how does sin(π/2)=1

Answer 5

Watch the trigonometric table...

Answer 6

what is that?

Answer 7

trigonometric table contains the values for all trigonometric functions
Visit here
http://www.sosmath.com/tables/trigtable/trigtable.html