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P is a point and P Ma n dP N are the per...

`P` is a point and `P Ma n dP N` are the perpendicular form `Ptoz-xa n dx-y` planes. If `O P` makes angles `theta,alpha,betaa n dgamma` with the plane `O M N` and the `x-y ,y-za n dz-x` planes, respectively, then prove that `cos e c^2theta=cos e c^2alpha+cos e c^2beta+cos e c^2gammadot`

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