$4^2-50$
$+7a-8b+5b-7a+5a-6b-8a+12b$
$\left(sec2\:x\:-\:1\right)\:\cdot\:csc2\:x\:\cdot\:cos\:x$
$3\left(-11\right)^4-3\left(-11\right)^3-\left(-11\right)^2+3\left(-1\right)-1\:$
$\left(3a+2b+1\right)^2$
$ydx\:=\:xlnxdy$
$\int_2^4\left(\frac{2}{x\sqrt{x^2-2}}\right)dx$
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