coordinate

Question: If the coordinates of vertices of $\Delta OAB$ are (0,0) $(\cos \alpha ,\,\sin \alpha )$ and $(-\sin \alpha ,\,\cos \alpha )$ respectively, then $O{{A}^{2}}+O{{B}^{2}}=$



1) 0
2) 1
3) 2
4) 3
Solution: Explanation: No Explanation
System of co-ordinates Distance between two points Section formulae

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