Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\int_{-\pi}^{\pi}|\cos\ x|dx$$

Evaluate

$\int _{-\pi }^{\pi }|\cos(x)|\mathrm{d}x$

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