anonymous
  • anonymous
Us the Sum Formula to: a. Find the exact value of cos 105 degrees b. Find the exact value of sin 5pi/12
Mathematics
jamiebookeater
  • jamiebookeater
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ganeshie8
  • ganeshie8
Hint for part a : 105 = 60 + 45
anonymous
  • anonymous
rvc
  • rvc
cos(A+B)=?

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anonymous
  • anonymous
@rvc wait is that it?
freckles
  • freckles
the question already provides a hint use the sum formula and we know to use the sum formula for cosine since we are asked to find cos(105) and @ganeshie8 gave you the hint that 105 is 60+45 and @rvc is just trying to get you to look at your identitys sheet and copy over the identity mentioned for cos(A+B) and replace the A with 60 and the B with 45 and evaluate using unit circle
anonymous
  • anonymous
how did he get 60 and 45 though? @freckles
myininaya
  • myininaya
60 and 45 when added gives you 105
anonymous
  • anonymous
yeah but why those in particular? 100 + 5 gives you 105 too?
myininaya
  • myininaya
is 100 and 5 on the unit circle?
myininaya
  • myininaya
60 and 45 are
rvc
  • rvc
well we have those values already and can easily plug in
ganeshie8
  • ganeshie8
|dw:1433395044353:dw|
anonymous
  • anonymous
OH OKAY

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