Hello,
I don't find usual trigonometric transform in sage :
expand (sin (2*x)) == 2*sin(x)*cos(x)
combine (cos(a)^2) == 1/2 + cos(2*a)/2
rewrite (sin(a), exp) == (exp(i*a)-exp(-i*a)) / (2*i)
I can use maxima("expand (sin(a+b))") or fricas ("...") calls but not
the inner sage system.
And use string isn't so pretty when it's the last computation we must
transform.
Is there such functions in sage ?
What sage files can I read if I want to understand how sage compute
similar algorithms.
Many thanks for your advices.
F. from France.
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