Hi, I'm having doubts to how I'm supposed to draw the graph of the triangle, is it just $y=x\tan(\alpha)$ and $y= -x\tan(\alpha)$ and $x=1$ and sketch the region?.
Also for the integral I calculated it to be
$\frac{1}{2} \left[\tan(\alpha) + \frac{\tan^3(\alpha)}{3 }\right]. $
Is the integral calculation correct?