Since l cosa l = cosa, cosa is nonnegative.
Since tana = -1, a lies in quadrant 2 or quadrant 4.
cos a is negative in quadrant 2.
So a lies in quadrant 4.
a = 2π - Tan-1(1) = 7π/4
Sarah J.
asked • 07/19/19If tan a = -1 and |cos a| = cos a, how do you find the value of a?
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