$7x+4\left(2x-6\right)$
$e^{3y}dy=dx$
$36h^2-49$
$4\cos\left(-x\right)\cdot\cos\left(90+x\right)$
$\int x 5 ^ { x } d x$
$\frac{x+3}{x^4+9x^2}$
$1-\frac{a^2}{25}$
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