$7-7cos\left(x\right)=sin^2\left(x\right)$
$x+x+3x$
$\int - 2 x ^ { 2 } e ^ { x } d x$
$\left(\frac{1}{5}x^5-\frac{1}{7}bc^2\right)^3$
$4x^2-12x+90$
$\cot^2x\sec^2x-1=1$
$x^2-6x-1;\:x=3$
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