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anonymous

  • one year ago

Medal and fan for those who can help me with precalc :)

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @Nurali

  3. anonymous
    • one year ago
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    @mathmate its a tough problem mate :/ could you please help

  4. mathmate
    • one year ago
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    Hint: Use FOIL to get the products then use trigo identities to simplify: cos(a+b)=cos(a)cos(b)-sin(a)sin(b) sin(a+b)=sin(a)cos(b)+cos(a)sin(b)

  5. anonymous
    • one year ago
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    do you multiply 3*7 by any chance?

  6. anonymous
    • one year ago
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    Im leaning towards A

  7. anonymous
    • one year ago
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    @mathmate @Nurali

  8. mathmate
    • one year ago
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    7 and 3 are multiplied similar to 3(x+1) * 7(x-1) = 21(x^2-1)

  9. anonymous
    • one year ago
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    never mind i got it its c

  10. anonymous
    • one year ago
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    I was doing it wrong

  11. mathmate
    • one year ago
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    bonne chance!

  12. anonymous
    • one year ago
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    3/7 (cos (-pi/8)

  13. anonymous
    • one year ago
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    Merci

  14. anonymous
    • one year ago
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    c'est vrai @mathmate ?

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spraguer (Moderator)
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