माना `f_(n) (theta) = (sum_(r=1)^(n) cos (4r - 3)theta)/(sum_(r = 1)^(n) sin (4r - 3)theta)`.
`{:(,"LrEHk-I",,"LrEHk-II"),((A),f_(3) ((pi)/(40))"बराबर है",(P),sqrt(2) - 1),((B),f_(5) ((5pi)/(108))"बराबर है",(Q),sqrt(2) + 1),((C),f_(7) ((pi)/(156)) "बराबर है",(R),2 + sqrt(3)),(,,(S),2 - sqrt(3)):}`

Answer

(A)-Q; (B)-S; (C )-R