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

If the coordinates of vertices of \[\Delta OAB\] are (0,0) \[(\cos \al

1.	If the coordinates of vertices of \[\Delta OAB\] are (0,0) \[(\cos \alpha ,\,\sin \alpha )\] and \[(-\sin \alpha ,\,\cos \alpha )\] respectively, then \[O{{A}^{2}}+O{{B}^{2}}=\]
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

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

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