If (a₁+ ????b₁) (a₂ + ????b₂).... (a???? + ????b????) = A + ????B, then ???? ∑ tan⁻¹ (b???? / a????) is equal to ????=1 (a) B / A (b) tan (B/A) (c) tan⁻¹ (B/A) (d) tan⁻¹ (A/B)
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plz text the problem correctly
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