$15+\left(-9+12\right)-\left(-10-9-15\right)-\left(-21\right)$
$\frac{cos^2x}{sinx}=cscx\:-\:sinx$
$\int\frac{x^2+2x-1}{x^2+9}dx$
$-x^2-5=-30-2x^2$
$4\left(5x+10\right)$
$\int\frac{2x+3}{\left(x-3\right)\left(x+3\right)}dx$
$2\left(3.1416\right)\left(3.5\right)\left(0.15\right)$
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