do u realise the 1.926 answer, the parameter used is cos(x)
instead as shown in the graph?
it means the root is at cos(1.926) (which produces an answer where
|cos x| <= 1) and not acos(1.926).
here i am solving for x directly, where x is of radian
measure.
cos(x) where x is a of radiam/degree dimension
acos(x) where x is a real number of no dimensions
nothing to do with the subtituting y or not, which is another
method. maybe u can use a = cos x in coolmyth's workings if u find
y too confusing for u.
