SOLUTION: without using a calculator, find the smallest positive theta in degree and radian measure for which
cos theta = - 1/2
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Question 941995: without using a calculator, find the smallest positive theta in degree and radian measure for which
cos theta = - 1/2
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
If the sign were not negative, then the rotating
vector would form a 30-60-90 triangle in the
1st quadrant. The cosine of 60 degrees is
-----------------
As the vector rotates, the first time that the cosine
is is when
or
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