$-9-7-8+2+5+4$
$\left(7x^4+y^3\right)\left(7x^4-y^3\right)$
$\int\cos^2\left(2x+5\right)dx$
$3\left(x\right)\left(\frac{1}{2}\right)^2$
$5a^4-10a+15a^3+20a^2$
$\sqrt{\frac{1}{4a}}$
$2700+1024$
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