TrigReduction:

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   Solve a*sin(beta) + b*cos(beta) = c.
   For a real answer c^2 < a^2 + b^2.

   Type TrigReduction for a demo.

   Since version 10.
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   Form:
   beta = TrigReduction( a, b, c )
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   Inputs
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   a                  Coefficient
   b                  Coefficient
   c                  Right hand side

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   Outputs
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   beta               Angle solution (rad)

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