Помогите пожалуйста вычислить:

1)[tex]\int\limits^2_1 {3x^{3} } \, dx[/tex]

2)[tex]\int\limits^4_2 \frac{dx}{x^{2} }[/tex]

3)[tex]\int\limits^\frac{\pi }{2} _0 {cos x} \, dx[/tex]

4)[tex]\int\limits^\pi _\frac{\pi}{2} {sin 2x} \, dx[/tex]
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