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x + (4*Cot[x])/3 - (Cot[x]*Csc[x]^2)/3


Integrate[Cot[x]^4, x] ==
x + (4*Cot[x])/3 - (Cot[x]*Csc[x]^2)/3



                4
Integrate[Cot[x] , x] == 

                            2
    4 Cot[x]   Cot[x] Csc[x]
x + -------- - --------------
       3             3

Time to compute: < 0.01 second

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