正弦波交流電圧の実効値

Nspire:
((1)/(2*π))*∫(((vm^(2)*(sin(θ))^(2))/(r)),θ,0,2*π)

Wolfram:
(1/(2 Pi))Integrate[(Vm^2 Sin[\[Theta]]^2)/R, {\[Theta], 0, 2 Pi}]