Question

If a vector A makes angles 45° and 60° with x and y axes respectively then the angle made by it with z-axis is
(A) 30°
(B) 60°
(C) 90°
(D) 120​

Answer 1

option (b) 60.

cos ^2α+cos^2β+cos^2r=1

where.α β r are angles made by p with x, y, z axes respectively.

here, α=45, β=60

1 + 1 +cos^2 r=1

2 4

=>cos^2r =1

4

r=60 degree.

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