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Math Help - How to prove this ?

  1. #1
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    Dhaka
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    Unhappy How to prove this ?

    Stucked on this for hours

    Given, √2cosA=cosB+cos³B and √2sinA=sinB-sin³B

    need to prove that,
    sin(A-B)=±1/3

    Somebody pls give the solution, thanks
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  2. #2
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    Re: How to prove this ?

    How to prove this ?-trig-11-feb.png
    Thanks from Adipal
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  3. #3
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    Re: How to prove this ?

    Yayyyyyyyy!!! That was just AWESOME!! Many many thanks!
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