$-\left(x+4\right)=-x+y$
$\left(-0.2x-1\right)\left(15-0.87x\right)$
$\lim_{x\to\infty}\:\frac{6x^4-8x^2}{3x^4-14}$
$\frac{sena-sen^2a}{cos^2a}=\frac{1}{csc^2a}$
$3\left(2x+1\right)>1\left(2x-2\right)$
$\left(4x+5c\right)^2$
$\:x^2y-8xy+16y^2$
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