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Let P M be the perpendicular from the p...

Let `P M` be the perpendicular from the point `P(1,2,3)` to the `x-y` plane. If ` vec O P` makes an angle `theta` with the positive direction of the `z-` axis and` vec O M` makes an angle `phi` with the positive direction of `x-` axis, `w h e r eO` is the origin and `thetaa n dphi` are acute angels, then a. `costhetacosphi=1//sqrt(14)` b. `sinthetasinphi=2//sqrt(14)` c. `""tanphi=2` d. `tantheta=sqrt(5)//3`

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