1.

If ("cos"^4 theta)/(x) + ("sin"^4 theta)/(y) = 1/(x + y)(theta is constant) then (dy)/(dx) =

Answer»

`XY`
`y/x`
`"tan"^2 theta`
`(x^2 + y^2) "SEC"^2 theta`

Answer :B::C


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