$121g^2-169y^4$
$\lim_{x\to0}\left(-3sinx+3x\right)$
$\int7x^6\left(x^7-10\right)dx$
$\left(2x+2y+y\right)^2$
$-92-12$
$\frac{\left(3\cdot10^8\right)}{400\cdot10^{-7}}$
$\int17z^3e^zdz$
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