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# C4 Parametrics Area Under Curve

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1. How did I get +24cos(4theta) instead of -24cos(4theta)?

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2. Could you post the question?
3. (Original post by TSRforum)
How did I get +24cos(4theta) instead of -24cos(4theta)?

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Several things are wrong.

1. It should be

2. . i.e: as you seem to think.
4. (Original post by Zacken)
Several things are wrong.

1. It should be

2. . i.e: as you seem to think.
So when it says (A-B) in the trig identity I should look at that as the difference between A and B?

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5. (Original post by TSRforum)
So when it says (A-B) in the trig identity I should look at that as the difference between A and B?

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That's generally what subtraction means, yes.
6. (Original post by Zacken)
That's generally what subtraction means, yes.
Not sure, difference of and might mean .

If by their last post OP means should be taken as then yes but only because .
7. (Original post by IrrationalRoot)
Not sure, difference of and might mean .

If by their last post OP means should be taken as then yes but only because .
Good point, I wasn't sure what the OP was asking.

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