$\lim_{x\to\infty}\left(\frac{x^2}{e^{4x}-1-4x}\right)$
$\int x^{-1}\cdot e^{10x}dx$
$3x^816x^640x^4$
$8^0+6+15\cdot2-2$
$\frac{sin^2-sin\left(x\right)-2}{sin\left(x\right)-2}-2=sin\left(x\right)+1$
$cos2x=1-2sinx$
$-19-\left(4-13\right)$
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