$2x^4y-x^2y+x=2$
$\frac{\sin^2\left(a\right)}{\tan^2\left(a\right)}$
$5\tan x-4\tan^2x=1$
$3x^2+4-7$
$\left(\sqrt[7]{2^8}\right)^7$
$\left(14y^2+15\right)-\left(-9y^4-7y^2+15\right)$
$14\cdot14\cdot14$
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