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Q.
- Find Equivalent Angle: To find an equivalent angle for that lies within the range of , we can subtract multiples of until the angle is within the desired range. However, since is only beyond , we can also find a coterminal angle by subtracting from , which gives us . But we need to consider that the sine function is negative in the third quadrant where lies, so we need to take the negative of the equivalent angle in the first quadrant to get the correct sign. Therefore, the equivalent angle is .
- Evaluate : Now we can evaluate by using the equivalent angle we found in the previous step. Since is equal to , and is within the range of , we have .
