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mitchelsewbaran

Write the expression as either the sine, cosine, or tangent of a single angle.

  • one year ago
  • one year ago

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  1. mitchelsewbaran
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    • one year ago
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  2. sirm3d
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    the problem resembles that of a cosine of a difference of two angles

    • one year ago
  3. sirm3d
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    \[\cos (A-B)=\cos A \cos B + \sin A \sin B\]

    • one year ago
  4. mitchelsewbaran
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    so is it cosin(pi/5 -pi/7)?

    • one year ago
  5. mitchelsewbaran
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    @sirm3d?

    • one year ago
  6. sirm3d
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    that's right.

    • one year ago
  7. sirm3d
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    you should combine pi/5-pi/7 into one angle, as required in the problem.

    • one year ago
  8. mitchelsewbaran
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    cos π/7?

    • one year ago
  9. sirm3d
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    \[\frac{\pi}{5}-\frac{\pi}{7}=\frac{7\pi-5\pi}{35}=\frac{2\pi}{35}\]

    • one year ago
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