r Cos[γ[t]] + 1/2 l Sqrt[1 - (r^2 Sin[γ[t]]^2)/l^2]
How can I ask Mathematica to write my expression without
l^2 in the denominator such as:
r Cos[γ[t]] + 1/2*Sqrt[l^2 - r^2 Sin[γ[t]]^2]
Sorry, if my question is very simple, but I have been unable to work out an answer.