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2018-04-12 22:26:03 +0100 received badge  Student (source)
2018-04-12 19:52:08 +0100 asked a question evaluate (simplify) trigonometric expression
t = var('t')
R = vector ((3*cos(t), 3*sin(t), 4*t))

dRdt = R.diff(t)
show(dRdt)

ds = dRdt.norm()
show(ds)

when I try to show ds it gives mi a trigonometric expression which is actually is equal to 5. I tried simplify() and trig_simplify but it didn't help...

Any tips are welcome. Thanks in advance