$x^2+x\:=\:42$
$2\cdot\sec^2x+7\cdot\sec x=4$
$\int_2^{3b}2xdx$
$2sin^2\theta\:+sin\theta\:-1$
$\lim_{x\to\infty}\left(5x\left(\frac{1}{2}\right)^x\right)$
$-11-\left(-3\right)$
$\int18t^5sin\left(6t^6\right)dt$
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