$25x^4y^2-20x^2yd^3+4d^6$
$\left(\frac{8}{9}x-\frac{5}{7}y\right)^2$
$x^2\sqrt{x-5x}$
$\tan\left(\arccos\frac{-4}{50}\right)$
$6\:sin\:4x\:sin\:5x\:$
$27\cdot27\cdot27$
$12x^2+11x-5$
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