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cot(-15pi)/(4)...

`cot(-15pi)/(4)`

Text Solution

Verified by Experts

`cot(-15pi)/(4) =-cot(15pi)/(4)`
`=-cot(2 xx 2pi - pi/4) = -(-cotpi/4)`
`=cotpi/4=cot45^(@)=1`
Therefore , `cot(-15pi)/(4)=1` Ans.
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