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

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The coefficients of 5th, 6th and 7th terms in the expansion of $(1+\text{x})^{\text{n}}$ are in A.P., find n.