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**Find the length of the curve given by the parametric representation...**

## Homework Statement

Calculate the length of the curve given by the parametric representation

r(t) = t

^{2}(cos t; sin t; cos 2t; sin 2t) for 1≤ t ≤+1:

## Homework Equations

## The Attempt at a Solution

I know that you need to assume: dx/dt ≥ 0 for α≤t≤β

Then you use the formula for 'L'

Imstruggling with the layout of the question.. Why are there semi-colons between the sin and cos terms?

If someone could explain this that would be great.

Regards as always.