`yx^(y-1)`
`y^2/(x (1-y log x) )`
`y/(x (1+y log x))`
None of these
`e^(-1)`
`e`
`1`
`0`
` a/b`
` b/a `
`1`
`0`
`1`
`2`
`0`
`3`
`f (x) cos [g (x)]`
`f (x) sin [g (x)]`
`g (x) cos [f (x)]`
`g (x) sin [f (x)]`
`2a^2`
`2b^2`
`2ab`
`2ac`
Only I
Only II
Only III
None of these
`y/x`
`(py)/(qx)`
`x/y`
`(qy)/(px)`
` ( 3^(x + y) - 3^x)/3^y`
` ( 3^(x + y) - (3^y - 1) )/(1- 3^x)`
` (3^x + 3^y)/(3^x - 3^y)`
`(3^x + 3^y)/( 1 + 3^(x + y) )`
`e^(-1)`
`e^(-2)`
`e`
`1`
`u + v`
`v^2`
`u^2 + v^2`
None of these
`- 4t (t^2 - 1)^(-2)`
`- 4t^3 (t^2 - 1)^(-3)`
`(t^2 +1) (t^2 - 1)^(-1) `
`- 4t^2 (t^2 - 1)^(-2)`
`(- sin x + e^x )^(-1)`
` ( sin x + e^x)/( cos x + e^x)^2`
` ( sin x - e^x)/( cos x + e^x)^3`
` ( sin x + e^x)/( cos x + e^x)^3`
`- q/p^2`
`- q/p^3`
`1/q`
`q/p^2`
`2`
`1`
`0`
`-1`