EM - Calculating Beamwidth, front-to-back ratio, radiation resistance and directivity

Given radiation intensity function of K(Θ) = Io^2 * (ηo/40*pi) * [sin(2Θ)/sin(Θ)]^2.

Find beamwidth, front-to-back ratio, radiation resistance and directivity of the antenna.

Please help!

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You Fail!..........Adam