The value of to satisfy the following inequality equation:
The values of for the interval to satisfy eq. are and .
The unit circle with co-ordinates and radius to find out the values of for the interval that cause .
Fig. Unit circle
From the unit circle figure:
The coordinate or cosine value is positive and should greater than , is observed in the first and fourth quadrant.
So, the values gets as and .
Cosine value is greater than or equal to in the third and second quadrant for the value of interval .
In the first quadrant , value of interval
In the third quadrant , value of interval
Therefore, the values of for the interval to satisfy eq. are and .
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