If\[{{\cos }^{-1}}p+{{\cos }^{-1}}q+{{\cos }^{-1}}r=\pi \]then\[{{p}^{2}}+{{q}^{2}}+{{r}^{2}}+2pqr=\] [Karnataka CET 2004]

If\[{{\cos }^{-1}}p+{{\cos }^{-1}}q+{{\cos }^{-1}}r=\pi \]then\[{{p}^{

1.	If\[{{\cos }^{-1}}p+{{\cos }^{-1}}q+{{\cos }^{-1}}r=\pi \]then\[{{p}^{2}}+{{q}^{2}}+{{r}^{2}}+2pqr=\] [Karnataka CET 2004]
A.	3
B.	1
C.	2
D.	-1
Answer» C. 2

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If\[{{\cos }^{-1}}p+{{\cos }^{-1}}q+{{\cos }^{-1}}r=\pi \]then\[{{p}^{2}}+{{q}^{2}}+{{r}^{2}}+2pqr=\] [Karnataka CET 2004]

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