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If ("cos"^4 theta)/(x) + ("sin"^4 theta)...

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

A

`xy`

B

`y/x`

C

`"tan"^2 theta`

D

`(x^2 + y^2) "sec"^2 theta`

Text Solution

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The correct Answer is:
B, C
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Knowledge Check

  • If x =a sec theta, y =b tan theta then (dy)/(dx) =

    A
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    B
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  • If x = theta -(1)/(theta) , y = theta + (1)/(theta) then (dy)/(dx) =

    A
    `x//y`
    B
    `y//x`
    C
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    D
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