A) \[{{15}^{o}}\]
B) \[{{45}^{o}}\]
C) \[{{75}^{o}}\]
D) \[9{{0}^{o}}\]
Correct Answer: D
Solution :
Coefficient of \[{{x}^{2}}\] + Coefficient of \[{{y}^{2}}\] \[=1-1=0\] \ Lines are perpendicular to each other.
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