$8.5\cdot41$
$x^2-12x+4\ge0$
$5-\left[7-2-\left(1-9\right)-3+12\:\right]+4$
$y^4+8y^2+16y=0$
$\sin^2a+1=2-\cos^2a$
$x^2+16xy+64y^2$
$\int4x^2e^{6x^3}dx$
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