$36x^2-6x-12$
$2\cdot\:\left(x^2-5x\right)-x^2+4$
$\left(10\right)-\left(20\right)-\left(-30\right)$
$2x^2\left(7x^2-3x+8\right)$
$3\cos3x\cdot\cos5x-5\sin3x\cdot\sin5x$
$\left(a^2+b^4\right)\left(a^2-b^4\right)$
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