$\left(4a-5\right)\left(4a+9\right)$
$y\:=\:2x\sqrt{\frac{t+x}{t-x}}$
$2d-6d$
$2x+6x+2x+6x$
$96x^2+256x-520$
$\frac{1+tan\left(x\right)}{1-tan\left(x\right)}=1+\frac{1+tan\left(x\right)}{1-tan\left(x\right)}$
$5\sin\left(2x\right)=9\tan\left(x\right)$
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