$1-cos^2u$
$-35-\left(-21\right)$
$\int12x^{-4}dx$
$13-\left(-21\right)$
$4^3-5^2+2$
$\left(4b-5\right)\left(4b+5\right)$
$cos\left(x+270\right)=sin\:x$
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