UPSC NDA Math Model Paper 2

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Question : 115 of 120

Marks: +1, -0

The lines x‌cos‌α+y‌sin‌α=p1 and x‌cos‌β+y‌sin‌β=p2 will be perpendicular if

α=β
|α−β|=
π
2
α=
π
2
α±β=
π
2

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