Simplify cos(90)
Problem
Solution
Identify the angle and the trigonometric function. The expression is the cosine of
90 degrees.Recall the coordinates on the unit circle. At
90 the point on the unit circle is(0,1) Apply the definition of cosine. On the unit circle,
cos(θ) is equal to thex coordinate of the point.Determine the value. Since the
x coordinate at90 is0 the value of the expression is0
Final Answer
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