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PART - 1 CH - 3 Motion in a Plane — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsPART - 1 CH - 3 Motion in a Plane3 Marks
Question
What is the meaning of the components of vectors along $X, Y, Z$ axes and prove that $\cos ^2 \alpha+\cos ^2$ $\beta+\cos ^2 r=1$.
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