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ok - i get same answers as u. But i dont see why u have put - c instead of + c.

i thought that when u have a positive cosine and negative sine u use

cos(x + c) because when all terms positive u use cos(x - c).

But the answers we have differ to the book. It has 20.3 and 260.3 degrees?

i still dont get to this if i use cos(x+c)? maybe book is wrong.

i thought that when u have a positive cosine and negative sine u use

cos(x + c) because when all terms positive u use cos(x - c).

But the answers we have differ to the book. It has 20.3 and 260.3 degrees?

i still dont get to this if i use cos(x+c)? maybe book is wrong.

ryan750

ok - i get same answers as u. But i dont see why u have put - c instead of + c.

i thought that when u have a positive cosine and negative sine u use

cos(x + c) because when all terms positive u use cos(x - c).

But the answers we have differ to the book. It has 20.3 and 260.3 degrees?

i still dont get to this if i use cos(x+c)? maybe book is wrong.

i thought that when u have a positive cosine and negative sine u use

cos(x + c) because when all terms positive u use cos(x - c).

But the answers we have differ to the book. It has 20.3 and 260.3 degrees?

i still dont get to this if i use cos(x+c)? maybe book is wrong.

It doesn't matter which you use as long as you are careful in equating the coefficients of cos@ and sin@ when expanding either

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