Question

Evaluate the following:

`cot(cos^-1  3/5)`

Answer 1

`cot(cos^-1  3/5)=cot{tan^-1  sqrt(1-(3/5)^2)/(3/5)}`    `[thereforecos^-1x=tan^-1  (sqrt(1-z^2)/x)]`

`=cot(tan^-1  (4/5)/(8/17))`

`=cot(cot^-1  3/4)`

`=3/4`