$-67\:+\:-12\:+\:18\:+\:-13\:+\:15$
$\sqrt[3]{a}.\sqrt[9]{a^3}$
$2\cos^2\left(2x\right)+3\cos\left(2x\right)+1=0$
$3xy^2+4y-7=0$
$6ms-6n^2+13mn-4sn-6n^2$
$\int x^2cos\left(x^2\right)dx$
$sin\left(2x\right)cos\left(4x\right)-cos\left(2x\right)sin\left(4x\right)=-0.75$
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