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

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$1.2+2.3+3.4+\ldots+n(n+1)=\frac{n}{3}(n+1)(n+2)$
points A and B respectively. If O is the origin, find the area of the triangle AOB.