Boy Mow Chau's answer to Anika's Junior College 2 H2 Maths Singapore question.
for the last part, the question ask to find the angle at which (b-a) is inclined to the z-axis.
this means we need to find the acute angle.
(b-a) is obtuse to the positive z-axis.
to get the acute angle,
we take 180 minus the angle found,
this means we need to find the acute angle.
(b-a) is obtuse to the positive z-axis.
to get the acute angle,
we take 180 minus the angle found,
Thank you so much for your detailed answer and help ! :)
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