$\frac{1-x}{\sqrt{x}}$
$\left(4a+1\right)\left(4a+2\right)$
$\frac{3}{cos^2x}=\:3cosec^2x$
$\frac{tan\left(x\right)+1}{sec^2\left(x\right)}=1$
$\left(5a-6\right)\left(5a-6\right)$
$0.4x^2-2;\:x=2.3$
$\log_a\left(x+y\right)+2\log_a\left(y\right)$
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