$\frac{\cos^2x}{1-\sin x^2}=1$
$\left(2x-3i\right)^4$
$\left(\frac{1x\sqrt[n]{an}}{a}\right)^n\left(x-3\right)^n$
$2.9\cdot26$
$49m^2-25$
$\left(2z^2-3p^2+2t\right)^2$
$\left(d^2+\left(2f-c\right)\right)^2$
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