$-3^4+6x^4+5$
$4x^2-20x+9$
$-9-\left(-8\right)\cdot7+\left(6\cdot\left(-2\right)\right)$
$cos2a=\frac{1}{3}$
$2\ln\left(2x\right)-\ln\left(x+3\right)=\ln\left(3x+5\right)$
$\int\frac{y^2}{\left(x^2+4\right)}dx$
$\left(3c^5\right)^2$
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