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Question
Evaluate the following:
`cot(cos^-1 3/5)`
Solution
`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`
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