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'Climbing' printed from https://nrich.maths.org/
For the first part draw the graph of $\sin x$, draw the line
segment joining the origin to the point $(\pi/2, 1)$ and draw the
line $y=x$.
For the second part draw the graph of $\tan x$ and draw straight
line segments joining the origin to the points $(a, \tan a)$ and
$(b, \tan b)$.