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Well, first of all, "calm down"! There really is no need to be overly nervous; an interview is essentially a conversation between you and someone who loves your subject every bit as much as you ...

Market research involves gathering data about customers, competitors and market trends.  

Primary - New research/data

Secondary - Already a...

@tan(A) = 5, tan(B) =4, tan(A - B) = 1/21

@tan(A) = -3, tan(B) = 4, tan(A - B) = 7/11

I can demonstrate how the answers can be obtained during the session.

Can be anything reasonable that indicates a shift in demand, e.g. greater perceived returns to education. Incorrect answers are supply-side based answers, e.g. Government makes the cost of University chea...

Perfect substitute could be anything like: Pepsi and Coca-Cola, PG Tips and Typhoo etc. Imperfect substitute can be things like: Tea and Coffee, Beer and Wine.