$\csc^4x-\csc^2x=\cot^2x+\cot^4$
$1-\cos^4\left(a\right)-\frac{1}{4}\sin^2\left(2a\right)+\cos\left(2a\right)$
$\lim_{x\to0}\left(\frac{3^x+5x-1}{2x}\right)$
$12.8\cdot126.7\cdot23.56$
$\left(a+1\right)\left(a-1\right)-2a+b$
$121x^2-176x+64=0$
$\sqrt{1}^{-1}$
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