$\int5\cos\left(5x\right)-6\sin\left(6x\right)dx$
$sen\:x=\frac{cos\:x}{ctg\:x}$
$\int x\sin\left(x^2+1\right)dx$
$\lim_{x\to-1}4x^2$
$8\left|-4\right|$
$51ab^2-85ab^3y-102a^3b$
$-3x^2+18x-23$
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