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(3 cos phi+cos 3 phi)/(3 sin phi-sin 3 p...

`(3 cos phi+cos 3 phi)/(3 sin phi-sin 3 phi)=`

A

`1+cot ^(2) phi`

B

`cot ^(4) phi`

C

`cot ^(3) phi`

D

`2 cot phi`

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