$\int\frac{x^2}{x^4-7x^2}dx$
$x^2+25x+150$
$\:\:2150=2.25x+5.75$
$4x^4-20x^2y+25y^2$
$tan^2x\:=\:1-2\:tan\:x$
$5d^2+65d+8^2+104$
$\frac{\sin\left(1\right)+\cos\left(1\right)}{\cos\left(1\right)}$
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