Write down the range of :
(i) `f(x) = cos^(-1)x `
(ii) `f(x) = cot^(-1)x`
(iii) ` f(x) = "cosec"^(-1) x `

Answer

(i)`0 le f(x) le x `
(ii) ` 0 lt f(x) lt x `
(iii) ` {:(0 lt f(x) le pi/2 ),(-pi/2 le f(x)lt 0):}}`