$6x^2+7x+1$
$x-3x-1$
$x^{11}\:x\:\:x^5$
$sin^2x-3cos^2x$
$x-x^3+4x+5x^2+11x^3+7x^2+9x^3$
$3x^2+\frac{4}{-2}-5$
$\int\frac{3x}{\sqrt{49x^2+16}}dx$
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