$\frac{\tan\left(x\right)-\sin\left(x\right)}{\sin\left(x\right)^2}$
$\left(5-5b\right)\left(2a-2b\right)$
$4x^2+6=10x$
$8xy+x+5+x+y+xy+2$
$\log\left(10x^2\right)-\log\left(100x\right)=1$
$\int\frac{2x+7}{x^{2}-4}dx$
$4+3\cdot6-2\cdot7$
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