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UPSC NDA I 2018 Mathematics Solved Paper

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Question : 52

Total: 120

What is the angle between the straight lines (m2−mn)y=(mn+n2)x+n3 and (mn+m2)y=(mn−n2)x+m3, where m>n ?

tan−1(
2mn
m2+n2
)
tan−1(
4m2n2
m4−n4
)
tan−1(
4m2n2
m4+n4
)
45°

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