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# factor formulas

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1. Hi Guys,
in the question below I'm ok using one of the factor formulas using A and B below but struggling to realise the sign of B . is B(-5pi/12) or (5pi/12) either way i still don't get the way the text book dealt with this question which i've attached it blow as well. A good explanation would be much appreciated . thanks guys.
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2. (Original post by Alen.m)
Hi Guys,
in the question below I'm ok using one of the factor formulas using A and B below but struggling to realise the sign of B . is B(-5pi/12) or (5pi/12) either way i still don't get the way the text book dealt with this question which i've attached it blow as well. A good explanation would be much appreciated . thanks guys.
3. (Original post by anujsr)
Does it make any difference if you switch around the value of A and B?
4. (Original post by Alen.m)
Does it make any difference if you switch around the value of A and B?
YES. But look at the question properly. The bottom part is different from the top. Remember the values of A and B should match the one in the question. Please give me a rep if this helped! Good luck for your exam
5. (Original post by anujsr)
YES. But look at the question properly. The bottom part is different from the top. Remember the values of A and B should match the one in the question. Please give me a rep if this helped! Good luck for your exam
So for the bottom part you take A=5pi/12 and B= pi/12?
6. (Original post by Alen.m)
So for the bottom part you take A=5pi/12 and B= pi/12?
Yeah
7. (Original post by anujsr)
Yeah
So basically the leading angle will always be A and the second one will always be B?
8. (Original post by Alen.m)
So basically the leading angle will always be A and the second one will always be B?
Yes
9. (Original post by Alen.m)
So basically the leading angle will always be A and the second one will always be B?
You need to be careful sometimes they may say -CosA + Cos B so you must rearrange and make it Cos B - Cos A. I doubt they are going to be that worse at setting. But what you are saying is right. the leading angle is A and the second one is B.

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