Solve cos 4x, if sin x - cos x = 1/3.

I'm not an expert at this but use the khan academy video on unit circle to help you tackle that problem.

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

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart