# Exercise 7: Trig functions (15 minutes)

Revise AnalyzeVariables.C to include a histogram of theta.

Note

I’ll make your life a little easier: the math function you want is TMath::ATan2(y,x), which computes the arctangent of y/x. It’s better to use this function than TMath::ATan(y/x), because the ATan2 function correctly handles the case when x=0.