KEAM 2020 Math Paper

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Question : 77 of 120

Marks: +1, -0

The angle between the planes x+y+z=1 and x−2y+3z=1 is

cos−1(
2
√42
)
cos−1(
5
√42
)
cos−1(
3
√42
)
cos−1(
1
√42
)
cos−1(
4
√42
)

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