Question

solve it guys .. ques no..16. .plz

Answer 1

l = cos π/4 , m = cos π/4

we know l^2 + m^2 + n^2 = 1

1/2+1/2+n^2 = 1

n = 0

Hence angle with the positive direction of z-axis is π/2

Thus required angle is π/2.

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