$\sin\left(a\right)\cdot\tan\left(a\right)+\cos\left(a\right)$
$x+y+10+2y$
$\cot\left(x\right)-\frac{\csc^2\left(x\right)}{\cot\left(x\right)}$
$33\cdot39$
$-7x-6y=-93$
$\left(x-4\right)dy-\frac{5}{y+3}dx=0$
$-4z+8-6z-1$
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