$\left(x^2+4\right)dy=\left(y^2-9\right)dx$
$\frac{x}{2y}-\frac{2x}{y};\:x=-6;\:y=1$
$-85+1-6+7-9$
$\int\frac{\left(x^2+2x\right)}{\sqrt{x^3+3x^2+2}}dx$
$1-sin^2\:\frac{b}{1}-cos\:b=-cos\:b$
$\int\left(4\sqrt{7}\right)dx$
$\left(-26\right)\cdot\left(-72\right)$
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