If from the top of a tower of 60 metre h...

If from the top of a tower of 60 metre heigh, the angles of depression of the top and floor of a house are `alpha` and `beta` respectively and if the height of the house is `(60sin(beta-alpha))/(x)`, then `x=`

`sinalphasinbeta`

`cosalphacosbeta`

`sinalphacosbeta`

`cosalphasinbeta`

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