$a^2+11a$
$-19.1\cdot\left(6.9-7.0\right)$
$sin\left(2x\right)dx\:+\:cos\left(9y\right)dy\:=\:0$
$\frac{\tan\left(40\right)+\tan\left(5\right)}{1-\tan\left(40\right)\tan\left(5\right)}$
$cos\left(x\right)+2cos\left(2x\right)+cos\left(3x\right)=2cos\left(2x\right)\left(cos\left(x\right)+1\right)$
$-\frac{12}{-3}$
$\left(v+5w\right)^2$
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