$-18\cdot15$
$\int_{-1}^1\left(3x^{-4}\right)dx$
$\int_0^{3\pi\:}3\tan\:^5\left(x\right)\sec\:^4\left(x\right)dx$
$-1.6\cdot8$
$\int_0^{\pi}\left(1+cos7t\right)^2sin7tdt$
$-\frac{1}{3}x+\frac{2}{3}x$
$sen\left(y-\frac{\pi\:}{4}\right)$
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