$\frac{3x}{\left(4+x\right)^2}$
$2\left(7-4\right)$
$x^2-4x+10$
$cot\:x+tan\:x\:=cos\:x\:sec\:x$
$b^2a+2\cdot2a^2$
$-\left(d+2\right)$
$t^2-6t+10$
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