cos−1(x) refers to an angle, let's call it Ø , so that
cosØ = x = x/1
so sketch a right-angled triangle, label the base angle Ø, it's adjacent side as 1, and its hypotenuse as x
then the other side is √(1 - x^2)
and cotØ = x/√(1 - x^2)
thus cot (cos−1(x)) = x/√(1 - x^2)
Simplify the expression cot (cos−1(x)).
Not sure how to do this.
1 answer
1 answer