(1, 1) पर वक्र y = x2 और x = y2 का प्रतिच्छेदन कोण __________ है

1
\({\tan ^{ - 1}}\left( {\frac{4}{3}} \right)\)
2
tan-1(1)
3
90°
4
\({\tan ^{ - 1}}\left( {\frac{3}{4}} \right)\)

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