$\infty-14$
$\left(a^2+\:b^2\right)\:=\:\left(a+b\right)^2\:-\:2ab$
$sin6\left(x\right)\left(sec2\left(x\right)sin2\left(x\right)+1\right)cos2\left(x\right)$
$5+4-6-8+19-18+15-49$
$\lim_{x\to15}\:\frac{\sin\left(\sqrt{x+15}\right)}{x+15}$
$\frac{x^4+1}{x^3-x^2+x-1}$
$2y^2-2y+1$
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