tan^–1 x + tan^–1 y = c is the general solution of the differential equation:
tan–1 x + tan–1 y = c is the general solution of the differential equation:
(A) dy/dx = (1+y2)/(1+x2)
(B) dy/dx = (1+x2)/(1+y2)
(C) (1 + x2) dy + (1 + y2) dx = 0
(D) (1 + x2) dx + (1 + y2) dy = 0
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