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Hi! New to this forum and signed up because I've just started a foundation degree in mechanical engineering, and having been out of education for a very long time beforehand, getting back to grips with mathematics and the like!

Anyway, I would like to ask for some advice on this problem, I know how the top part of the fraction come about, as well as the lower case and upper case m in the lower part of the fraction, but still unsure as to why sin(theta) is squared? Thanks in advance!

Anyway, I would like to ask for some advice on this problem, I know how the top part of the fraction come about, as well as the lower case and upper case m in the lower part of the fraction, but still unsure as to why sin(theta) is squared? Thanks in advance!

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