$\int\frac{7}{x^2-3x-10}dx$
$\frac{1}{1+\tan^2y}+\frac{1}{1+\cot^2y}=1$
$a^2-a+1$
$2=x$
$-423+164$
$xy-5x^2y^2-3x^2$
$-5d+3d+2d$
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