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1.1k views
in Limit, continuity and differentiability by (52.5k points)

If cos4α/x + sin4α/y = 1/(x + y) then dy/dx =

(A) xy

(B) tan2α

(C) 0

(D) (x2 + y2)sec2α

1 Answer

+1 vote
by (54.8k points)
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Best answer

Answer is (B) tan2α

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