$\frac{3x^2+4x-11}{x+3}$
$x^3-3x^2+4$
$-9x-6\:x\:2$
$121y^{10}-4x^8$
$\frac{5}{6}a^3b+25a^5b^2+\frac{15}{7}a^4b$
$\frac{sinx+sin9x}{2sin5x}=cos4x$
$27+3\cdot5-6$
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