The angle that the vector A=2 î+3 ĵ makes with y-axis is- (1) tan ^-1(3 / 2) (2) tan ^-1(2 / 3) (...

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The angle that the vector A=2 î+3 ĵ makes with y-axis is-
(1) tan ^-1(3 / 2)
(2) tan ^-1(2 / 3)
(3) sin ^-1(2 / 3)
(4) cos ^-1(3 / 2)

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Sir but we take the cos beta =Ay/A and A is magnitude??

nadeabhi