If straight lines \[ax+by+p=0\] and \[x\cos \alpha +y\sin \alpha -p=0\ – McqOptions

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1.	If straight lines \[ax+by+p=0\] and \[x\cos \alpha +y\sin \alpha -p=0\] include an angle \[\pi /4\] between them and meet the straight line \[x\sin \alpha -y\cos \alpha =0\] in the same point, then the value of \[{{a}^{2}}+{{b}^{2}}\]is equal to
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

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