$sin\left(6-7x^2\right)\cdot sin\left(6-7x^2\right)$
$\frac{\cos\left(x\right)}{\sin\left(x\right)}=-13.36471$
$x^2+2x-35<0$
$\frac{x^2}{4+x^4}$
$\frac{4a^4b^{-3}}{ba^{-3}}$
$3x^2\:+\:5x\:+3\:\:entre\:x\:+\:1$
$64a^2-16a+1$
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