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bfoster1

  • 3 years ago

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

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  1. NoelGreco
    • 3 years ago
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    Do you mean\[\sin^{-1} (\sin \frac{ \pi }{ 10 })\]?

  2. NoelGreco
    • 3 years ago
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    oops 3pi/10

  3. bfoster1
    • 3 years ago
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    yes I do

  4. NoelGreco
    • 3 years ago
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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.

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