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making a parameter in an integrand real

• To: mathgroup at smc.vnet.net
• Subject: [mg116742] making a parameter in an integrand real
• From: alan <alansbarnett at verizon.net>
• Date: Fri, 25 Feb 2011 06:38:20 -0500 (EST)

How do I get mathematica to consider a parameter in an integrand to be
real.

Example:
In[1]:Integrate[1/(Cos[x] Sqrt[Cos[x]2 - a2]), x]

ArcTanh[(Sqrt[2] Sqrt[-a2] Sin[x])/Sqrt[1 - 2 a2 + Cos[2 x]]]/Sqrt[-
a2]

But I want a2>0 (a real).