$64b^4-36a^2$
$\log_{2^x}=4$
$25m^2+70mn+49n^2$
$\sqrt{40-x^2}+4=x$
$-7-\left(4-6\right)-\left(1+5\right)$
$y^4-y=0$
$\frac{cosec\left(x\right)}{cot\left(x\right)}=sec\left(x\right)$
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