$-4\left(2\right)\cos\left(2x\right)\left(-2\sin\left(2x\right)\right)=8\sin\left(4x\right)$
$\left(-\:5xy^4+\:3x^2\:y^2\:\right)\left(-\:5xy^4-\:3x^2\:y^2\:\right)$
$8x-15+3x^2+4x^4-3x+22$
$18-\left(-81\right)$
$30\::\:\left(4\:-\:2\:.\:7\right)\:+\:\left(-8\::\:2\:-\:3\right)\:.\:2$
$\int\left(2\cos\left(2x-3\right)\right)dx$
$-8m-9m+5m$
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