$\frac{1}{2}2730\cdot25.27^2$
$\left(x-3\right)\left(2x+1\right)$
$\frac{sin3x+sin7x}{cos3x-cos7x}=cot2x$
$\left(5c-2d\right)^2$
$x+3\ge7$
$1-\cot\left(x\right)=1+\cot\left(-x\right)$
$\int\frac{1}{2}x^3dx$
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