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if f(theta)= Costheta1.Cos theta2. cos t...

if `f(theta)= Costheta_1.Cos theta_2. cos theta_3….. Cos theta_n, ` show that `{ tan theta_1+ tan theta_2+ tan theta_3+…..+ tan theta_n } = - {(f' (theta))/(f(theta))},`

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