The value of to satisfy the following inequality equation:
The values of for the interval to satisfy eq. are .
That means, for the tangent value of , the value of sine and cosine value are same with the different signs. It will occurs at only , angle is odd multiple of .
So, for the interval are . These angles break into 4 sections as:
In the first quadrant , value of interval , it is greater than that means the inequality equation is not satisfied with this range.
In the second quadrant , value of interval
In the third quadrant , value of interval
In the fourth quadrant , value of interval
So, the unit circle with co-ordinates and radius :
Fig. Unit circle
Therefore, the values of for the interval to satisfy eq. are .
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