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bfoster1 Group Title

How do i decide which reference triangle to use for sin-1 (sin 3pi/10)?

  • one year ago
  • one year ago

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  1. NoelGreco Group Title
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    Do you mean\[\sin^{-1} (\sin \frac{ \pi }{ 10 })\]?

    • one year ago
  2. NoelGreco Group Title
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    oops 3pi/10

    • one year ago
  3. bfoster1 Group Title
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    yes I do

    • one year ago
  4. NoelGreco Group Title
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    First, make sure that the angle is in the domain of the inverse sine function [-2pi,2pi]. Then remember that the sin generates a number, and inverse sin generates an angle - in this case the same angle you took the sin of.

    • one year ago
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spraguer (Moderator)
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