$2a+4b-6+3a$
$\int t\sec^2\left(3t\right)dt$
$7^4-5^4$
$49x^6-81y^{10}$
$4\sin\left(2x\right)\cos\left(2x\right)\cos\left(x\right)-\sin\left(x\right)\sin\left(2x\right)^2$
$81-x^2$
$\int r^3\cdot\frac{1}{sqrt\left(25+r^2\right)}dr$
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