Evaluate the following integral: `int_(-pi//4)^(pi//4)|sinx|dx`

Explanation

`I=int_{-pi 4}^{pi / 4}|sin x| d x`

`
I=int_{-pi 4}^{0}-sin x d x+int_{0}^{pi / 4} sin x d x`

`
I=.cos x|_{-pi 4} ^{0}-.(-cos x)|_{0} ^{pi 4}`

`
I=1-frac{1}{sqrt{2}}+frac{1}{sqrt{2}}+1=2`

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