$\frac{\frac{3}{4}b^3}{\frac{2}{3}c^2}$
$1a$
$14x^8-23x^{13}+2x^{11}-13x^9$
$x+y=30$
$\sin\left(90^{\circ}\right)=\:\frac{1}{\frac{1}{4}}$
$3-x\cdot x-1$
$\left(\frac{x\:sen\:x}{1+tan^2x}\right)$
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