Wolfram Mathematica Online Integrator
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Integrate[Cos[a*x]^(-2*m), x] ==
-((Cos[a*x]^(1 - 2*m)*Csc[a*x]*Hypergeometric2F1[1/2,
1/2 - m, 3/2 - m, Cos[a*x]^2]*Sqrt[Sin[a*x]^2])/
(a - 2*a*m))
-2 m Integrate[Cos[a x] , x] ==
1 - 2 m
-((Cos[a x] Csc[a x]
1 1 3 2
Hypergeometric2F1[-, - - m, - - m, Cos[a x] ]
2 2 2
2
Sqrt[Sin[a x] ]) / (a - 2 a m))
Time to compute: 0.23 second
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