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Evaluate the trigonometric functions by memory or by contruscting appropriate triangles for the given special angles.

(a) csc 30deg
(b) sin pi/4

  • Pre-calc -

    Somewhere in your notes or your textbook you should have diagrams of the 30-60-90 and the 45-45-90 right-angled triangles and their sides.

    remember csc30° = 1/sin30° , which you should know
    and π/4 =45°, and you should know that as well

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