Half the angle of nip, (?), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?
A. cos ? = (dr + dp)/(dr + df)

B. cos ? = (dr + df)/(dr + dp)

C. sin ? = (dr + dp)/(dr + df)

D. tan ? = (dr + dp)/(dr + df)

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