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Attempt following question by selecting a choice to answer.
If 0° ≤ ≤ 360°,
then find one possible value of
for which cos = - .fff DDD
Step 1: The cosine function is negative only in quadrants II and III, so draw the reference triangles in these quadrants.
Step 2: Since cos θ =
= - 1 and
Step 3: The values of θ for which cos θ = -
are 135° and 225°.