On Thu, 27 Nov 2008, Dan Stanger wrote
>There is a trig identity which converts 4*a*b*(sin(x)+cos(x)) to
>sqrt(2)*4*a*b*cos(x-atan2(a,b)).
>Then the integrand can be expanded into I0(4*sqrt(2)*a*b)+ a sum
>containing terms multiplied by cos(n*(x+atan2(a,b))
>which when integrated between 0 and 2*pi give 0.
Could you provide more details about the integrand being
expanded into " I0(4*sqrt(2)*a*b)+ a sum containing
terms multiplied by cos(n*(x+atan2(a,b)) " ?
Ted Woollett