$x^2-50xy+625y^2$
$21y^2-37y+12$
$\int3\sqrt{4-x^2}dx$
$f\left(x\right)=2x-6$
$\int cos^3\left(2x+3\right)dx$
$-21\cdot2$
$\left(-x^2-y^2\right)^2$
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