A-Level Edexcel C3 June 2010 Q7a : ExamSolutions

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[X.]

OK, thanks; I wasn't sure whether or not it was required. Thank you for your brilliant videos, BTW.

[ExamSolutions_Maths]

Sorry, I see what you mean. Yes, I should have done that.

[Dutchie]

Im confused, in my lessons we always do the sine term divided by the cos term because tan=sin/cos. What is the rreason for this being B/A

[X.]

I thought that the question says to express your answer in the form Rsin(x-a) (I can't write theta or alpha), but it seems like you've just stated the constants R, x and a. Would they not want it expressed in the form stated in the question? Do they want you to substitute the constants into Rsin(x-a)?

[X.]

So, despite what the question says, you don't actually have to write it out in the form Rsin(x+a)?

[wyrwshwsreyy]

I did this, but why do you get the mark for working out R if it is not needed in working out alpha? (what the question asked)

also, thanks very much for the videos they are really really helpful!