$\left\{4-\left(-30\right)+15\right\}$
$\frac{dx}{1+4y^2}=-\frac{x}{1+x^4}dx$
$\frac{\left(x^2+5x+6\right)}{x^2+6x+9}$
$2.\left(-8\right)-3.\left(-7\right)-4.\left(+3\right)$
$\int-2.5x^5dx$
$tan\left(x\right)+cot\left(x\right)=\frac{1}{cos^2x}$
$8-4y-5y$
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