$\frac{1}{1-\sin\:\left(\alpha\:\right)}-\frac{1}{1+\sin\:\left(\alpha\:\right)}=2\tan\:\left(\alpha\:\right)\sec\:\left(\alpha\:\right)$
$2a-\left\{-x+a-1\right\}-\left\{a+x-3\right\}$
$ax^2-5am^3+am^3x^2-5a$
$20+3-5.5+3$
$\frac{1}{6x-x^2}$
$\frac{1}{5}-\frac{1}{5}$
$cos=0.4217$
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