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(4*Sin[a*x] + Sin[2*a*x])/(6*a*(1 + Cos[a*x])^2)


Integrate[(1 + Cos[a*x])^(-2), x] ==
(4*Sin[a*x] + Sin[2*a*x])/(6*a*(1 + Cos[a*x])^2)



                        -2
Integrate[(1 + Cos[a x])  , x] == 

4 Sin[a x] + Sin[2 a x]
-----------------------
                    2
  6 a (1 + Cos[a x])

Time to compute: 0.05 second

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