$\cot\frac{3\pi}{5}x-1=0$
$\sin\left(90+2a\right)=\cos\left(2a\right)$
$\left(x^4-y^4\right)^2$
$f\left(x\right)=\frac{x-1}{x-3}+\frac{x-4}{x-5}$
$\csc^{-1}=-1.1126$
$\lim_{x\to\infty}\left(6x^{\frac{1}{x}}\right)$
$\int\frac{12c^2}{\left(5-4c^3\right)^2}dc$
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