Question
Sketch the graphs of the following functions:
$\text{f(x)}=2\sec\pi\text{x}$
$\text{f(x)}=2\sec\pi\text{x}$

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Show that $a : b = \left( \begin{array} { c } { m + \sqrt { m ^ { 2 } - n ^ { 2 } } } \end{array} \right) : \left( m - \sqrt { m ^ { 2 } - n ^ { 2 } } \right)$Find a, if the coefficients of x2 and x3 in the expansion of $(3+\text{ax})^{9}$ are equal.