$-15-\left(-25\right)$
$x^2=\left(4x^2y^3\:+1\right)^2$
$6\left(20\right)^2+16\left(20\right)-6$
$25\cdot\left(18\right)\cdot\left(-16\right)\cdot\left(-1\right)$
$\int\ln\left(\ln y\right)dy$
$sin30^{\circ}cos45^{\circ}+cos30^{\circ}sin45^{\circ}$
$\int\left(t^4e^t\right)dt$
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