$\left(4f+5\right)\left(4f-7\right)$
$-4+-1+-1+-8$
$x^2-14x\:+9x^2$
$\frac{tanx^2}{1+cot\:x^2}$
$\int_2^6\:3\left(2x+1\right)dx$
$\left(1+\frac{1}{2n}\right)^n$
$x ^ { 2 } - 8 x + 11 = 0$
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