$sin^2x+4cos^2x$
$8\:-\:5\:-\:34\:+\:15\:-\:1$
$\lim_{x\to\infty}\left(\frac{3x^2+x+1}{e^{3x}}\right)$
$y'=\frac{x^2}{y}$
$-248\::\:-11$
$\frac{1}{x^2}-x$
$\left(10a+3b\right)\cdot\left(10a-3b\right)$
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