TRIG

find:


sin 23pi/12


i got totally the wrong answer how do i approach this?

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  2. 👎 0
  3. 👁 175
asked by Carry
  1. That is pi/12 less than 2 pi (360 degrees), which would be 345 or -15 degrees. The sin of that angle is -0.2588

    If you don't want the decimal approximation, it is

    -sin(45 - 30) = -sin 45 cos 30 + sin 30 cos 45 = (sqrt 2)/2*[1/2 - (sqrt3)/2]
    = (sqrt2)/4 -(sqrt6)/4

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    posted by drwls
  2. haha i got that too! but the right answer is

    (-root(2-root(3)))/2

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    posted by Carry
  3. why don't you evaluate your "right" answer and compare it with drwls answer ?

    MMMhhh ??

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    posted by Reiny

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