# Integrals

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19. âˆ«0 to (pi/4) of xÂ²cos x dx

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#### Solution Preview

F = âˆ«x2 (d sin(x)/ dx) dx

= x2 sin(x) - âˆ«2x sin(x) dx

= x2 sin(x) - 2âˆ«x sin(x) dx

= x2 sin(x) - 2âˆ«x (-cos(x)') dx

= ...

#### Solution Summary

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