$\cos\left(x\right)=-\frac{3}{7}$
$20.27-5.79$
$\left(4m+1\right)^4$
$\frac{d^4}{dx^4}\left(8.5x^4-8x^3\right)$
$y^2-7y+30$
$\int2x\left(1-6x\right)^2dx$
$6\cdot450$
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