$-\frac{4}{7}a+\left(-\frac{2}{7}a\right)+\frac{1}{7}$
$\frac{1}{cscx+1}-\frac{1}{cscx-1}=-2\tan^2x$
$\left(x-2\right)^2+y^2=25$
$3\frac{5}{3}$
$\:sen\:\alpha+cosec\:\alpha$
$60\cdot834$
$\left(5xy^2\right)^4$
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