$\int_0^{\pi}\left(sec^2\left(\frac{t}{3}\right)\right)dt$
$\frac{cos5x-cos7x}{sin5x-sin7x}$
$\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)+\frac{\cos\left(x\right)}{1+sin^2x}$
$a^4-5a^2+25$
$-22st+7st$
$-0,55-\:-1.2$
$2-3x\le-2$
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