sinTheta is negative in the 1st and 3rd quadrants the 1st and 2nd quadrants the 3rd and 4th quadrants the 2nd and 4th quadrants

The correct answer is: the 3rd and 4th quadrants.<br /><br />In the unit circle, the sine function represents the y-coordinate of a point on the circle. In the 3rd quadrant, the y-coordinate is negative, so the sine of an angle in the 3rd quadrant is negative. Similarly, in the 4th quadrant, the y-coordinate is also negative, so the sine of an angle in the 4th quadrant is negative. Therefore, the sine function is negative in the 3rd and 4th quadrants.