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Thread: Help plz last question of 2013 hsc 2U

  1. #1
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    Help plz last question of 2013 hsc 2U

    Can someone please explain why you add the identities together as shown in the solutions before for part c ii. Thank you.







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  2. #2
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    Re: Help plz last question of 2013 hsc 2U

    They're deriving the proof by solving simultaneously--> hence they add the identities together

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