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Answer» -theta) = sin(theta)
Answer: As angle theta lies in the first quadrant, where, 90° < THEETA < 0°
& (180° - theeta) lies in the 2nd quadrant.
(theta means ray rotated anticlockwise) , ( - theta means ray is rotated clockwise)
We know that,sin theta is the ratio of perpendicular( opposite side) to the hypotenuse. & perpendiculars, in both the QUADRANTS( 1st & 2nd quadrant) are POSITIVE as these are going upwards. But in 3rd & 4th quadrant, perpendiculars become negative as these will be downwards.
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