$5soc\left(2x\right)=5sin^2x+4$
$2a-3b-5c+9a-8b+15c$
$-1076-850$
$\:2ab+4a,\:a=3,\:b=1$
$\frac{d^2}{dx^2}\left(-11sinx\right)$
$-5b-3b+2c+2c$
$2x^4y^3\cdot3x^3y$
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