How do you derive a formula for both and ? Do you just use the sum and difference formulas?
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What do you mean by "deriving" the "formulas"? Are you supposed to restate the expressions in terms of and ? Thank you!
Originally Posted by stapel What do you mean by "deriving" the "formulas"? Are you supposed to restate the expressions in terms of and ? Thank you! It doesn't say specifically but I think so. So would you use the sum and difference formulas to derive?
Assuming you mean what stapel suggested, that is writing them in terms of , , then, yes. You use the sum formulas. So and use the formulas above. Similarly for and .
Originally Posted by HallsofIvy Assuming you mean what stapel suggested, that is writing them in terms of , , then, yes. You use the sum formulas. So and use the formulas above. Similarly for and . Ok thanx alot.
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