Hi, this seems very basic, but I wasn't able to figure it out. Let's say
I have a function:

sage: f(t)
-4*(5*sqrt(2)*cos(1/2*sqrt(2)*sqrt(5)) -
2*sqrt(5)*sin(1/2*sqrt(2)*sqrt(5)))*sin(1/2*sqrt(5)*t)/(sqrt(5)*sin(1/2*sqrt(2)*sqrt(5))^2
+ sqrt(5)*cos(1/2*sqrt(2)*sqrt(5))^2) +
4*(5*sqrt(2)*sin(1/2*sqrt(2)*sqrt(5)) +
2*sqrt(5)*cos(1/2*sqrt(2)*sqrt(5)))*cos(1/2*sqrt(5)*t)/(sqrt(5)*sin(1/2*sqrt(2)*sqrt(5))^2
+ sqrt(5)*cos(1/2*sqrt(2)*sqrt(5))^2) - 8

how do I tell sage to evaluate numerically everything but sin(), cos()
and t? I.e. I know this function is in the form 

f(t) = a*sin(b*t) + c*cos(d*t)

can I tell sage to put it in this form, evaluating numerically a,b,c
and d?

kind regards
renato

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