Question

Question 8! http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s08_qp_3.pdf

Answer 1

Apparently y/TN = dy/dx How is this?

Answer 2

Let b be the base length of the triangle
\[dy/dx=y/b\]
\[b=ydx/dy\]
\[(yb)/2=tanx\]
\[y^2dx/dy=2tanx\]
\[dy/dx=y^2cotx/2\]
See
its simple

Answer 3

what's b?

Answer 4

you see the slope of tangent is dy/dx which is equal to tanx which is again equalyto x/TN
i have taken TN as b

Answer 5

is b x?

Answer 6

no b is TN

Answer 7

TN is x no?