$\lim_{x\to2}\left(1+x^2\right)$
$64x^2-16xy+y^2$
$2 y + 4 ( y + 1 )$
$\int\left(8x^5+5x^4-4x^3-6x^2-2x-3\right)dx$
$-875+-745$
$2\sin\left(4x\right)=1$
$\lim_{x\to0}\left(cos\:x\right)^{\frac{2}{sen\:x}}$
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