FInd My attempt : Using this identity : The LHS can be written as . but it is not anywhere nearer to ,there must be some problem with my proving .
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Originally Posted by mathaddict FInd My attempt : Using this identity : The LHS can be written as . but it is not anywhere nearer to ,there must be some problem with my proving . You have made a couple of sign errors. The last line should be: and the right hand side obligingly factorises into .
Thanks Mr F , i try to factorise and i still can't get the proof right .
Hello, mathaddict! I'll modify your work ... and include all the steps. FInd: . Using this identity: . . . we have: . The LHS can be written as . We have: . . . . . . . . . . . . . . . . . . . . . Factor: . . . . . . . . . Therefore: .
Thanks a lot Soroban , btw , is it an algebraic identity ?
Yes. Use the fact that: So:
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