1.

A(3,-1),B(2,3) and C(5,1) are given then m angleA = ………

Answer»

`cos^(-1)""(3)/(sqrt(34))`
`PI-cos^(-1)""(3)/(sqrt(34))`
`sin^(-1)""(5)/(sqrt(34))`
`(pi)/(2)`

Answer :A


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