Sketch a graph of the function y=cos^-1x Part I: First, sketch at least two periods of the function y=cosx
on the graph below.
What are the domain and range of the function y=cosx
Restrict the domain of the functiony=cosx
so that it may be inverted. That is, select the portion of the graph ofcosx that is suitable for inverting. Mark that portion on your graph from Part I.

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584