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You are here: Home > Arithmetic > CAST

CAST

 

Mnemonic Device:

  • CAST

Explanation: to remember the CAST Rule for trigonometric functions. Go counterclockwise, starting from the bottom right quadrant of graph axes.

  • C is the area where the angle is positive for Cosine.
  • A is the area where the angle is positive for all trigonometric functions.
  • S is the area where the angle is positive for Sine.
  • T is the area where the angle is positive for Tangent.

Additional Note: Always measure from the x-axis to the angle line.

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