anonymous
  • anonymous
Medal and fan for those who can help me with precalc :)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
anonymous
  • anonymous
@Nurali
anonymous
  • anonymous
@mathmate its a tough problem mate :/ could you please help

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mathmate
  • mathmate
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)
anonymous
  • anonymous
do you multiply 3*7 by any chance?
anonymous
  • anonymous
Im leaning towards A
anonymous
  • anonymous
@mathmate @Nurali
mathmate
  • mathmate
7 and 3 are multiplied similar to 3(x+1) * 7(x-1) = 21(x^2-1)
anonymous
  • anonymous
never mind i got it its c
anonymous
  • anonymous
I was doing it wrong
mathmate
  • mathmate
bonne chance!
anonymous
  • anonymous
3/7 (cos (-pi/8)
anonymous
  • anonymous
Merci
anonymous
  • anonymous
c'est vrai @mathmate ?

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