$\left(\frac{x}{2}-3y\right)^2$
$5x^2;\:x=3$
$\frac{80}{16}$
$22ab^2+12a^4-8ab$
$z^25-3^2y$
$3.\left(2x^4+3x^2-5x+2\right)-4.\left(-2x^2+4x-3\right)$
$\sin\left(\frac{15}{17}+\frac{4}{3}\right)$
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