The angle between the lines \[x\cos {{\alpha }_{1}}+y\sin {{\alpha }_{1}}={{p}_{1}}\] and \[x\cos {{\alpha }_{2}}+y\sin {{\alpha }_{2}}={{p}_{2}}\]is

\[({{\alpha }_{1}}+{{\alpha }_{2}})\]

\[({{\alpha }_{1}}\tilde{\ }{{\alpha }_{2}})\]

The angle between the lines \[x\cos {{\alpha }_{1}}+y\sin {{\alpha }_{

1.	The angle between the lines \[x\cos {{\alpha }_{1}}+y\sin {{\alpha }_{1}}={{p}_{1}}\] and \[x\cos {{\alpha }_{2}}+y\sin {{\alpha }_{2}}={{p}_{2}}\]is
A.	\[({{\alpha }_{1}}+{{\alpha }_{2}})\]
B.	\[({{\alpha }_{1}}\tilde{\ }{{\alpha }_{2}})\]
C.	\[2{{\alpha }_{1}}\]
D.	\[2{{\alpha }_{2}}\]
Answer» C. \[2{{\alpha }_{1}}\]

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The angle between the lines \[x\cos {{\alpha }_{1}}+y\sin {{\alpha }_{1}}={{p}_{1}}\] and \[x\cos {{\alpha }_{2}}+y\sin {{\alpha }_{2}}={{p}_{2}}\]is

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