http://i33.tinypic.com/35bsb5t.jpg

i opened the integral on 0 till pi/2 interval

f(x)sin(nx)cos(x/2)dx

which is a coefficient of a foorie series

in order to find a coefficient we do <f,e_i>

where e_i is the orthonormal vector

i cant see how its a coefficient

??

its has 3 function in it so it doesnt resemble a coefficient formulla

???