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pre calc

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express the followinf trig functions in terms of an acute angle.


(a) cos 143 degrees

(b) tan 192 degrees

  • pre calc -

    I do these with the following steps:
    cos 143
    - which quadrant is it in? --- 2nd
    - by CAST rule, what sign is the cosine in the 2nd? --- negative
    - how far from 143º to the x-axis ? --- 37

    so cos 143 = - cos 37

    do the other one the same way.

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