`n/(n^2 - 1)`
`n/(n^2 + 1)`
`n/(2n^2 + 1)`
`((n^2 - 1)/(n^2 + 1))`
Only I
Only II
Only III
None of these
` d . ( cos alpha cos beta)/(cos (alpha - beta))`
` d . ( sin alpha cos beta)/(sin (alpha - beta))`
` d . ( sin alpha sin beta)/(sin ( beta - alpha))`
` d . ( sin beta sin alpha)/(sin ( alpha - beta))`
`50m`
`18m`
`16m`
`15m``
`(15)/2 sqrt3 m`
`15 sqrt3 m`
`10 sqrt3 m`
None of these
`sin alpha sin beta`
`cos alpha cos beta`
`sin alpha cos beta`
`cos alpha sin beta`
`(h (tan beta- tan alpha))/(tan beta)`
`(h tan beta- tan alpha)/(tan^2 beta)`
`( tan beta- tan alpha)/(tan beta)`
`(h tan beta+ tan alpha)/(tan beta)`
`6`
`10`
`20`
`5`
`240 m`
`500 m`
`300 m`
`400 m`
Only I
Only II
Both I and II
Neither I nor II
`( tan (alpha + beta))/( cot alpha cot beta - 1)`
`( cot (alpha + beta))/( cot alpha cot beta - 1)`
`( tan (alpha + beta))/( cot alpha cot beta + 1)`
`( cot (alpha + beta))/( cot alpha cot beta + 1)`
`5` min
`15` min
`7 1/2` min
`245 s`
`(50)/sqrt3`
`180 sqrt3`
`216 sqrt3`
None of these
`40(\sqrt{2}-1)`
`40(\sqrt{3}-\sqrt{2})`
`20\sqrt{2}`
`20(\sqrt{3}-1)`