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In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°. The value of C is 

(1) 12πf(2πfL+R)

(2) 1πf(2πfL+R)

(c) 12πf(2πfLR)

(4) 1πf(2πfLR)