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What is the sign of \(\sin x\) in the first quadrant?

Answer and explanation

Correct answer: Positive

The governing concept is the sign pattern of trigonometric functions in the four quadrants. In the first quadrant, an angle lies between \(0\) and \(\pi/2\), so its unit-circle point has both x- and y-coordinates positive. Since sine is the y-coordinate, \(\sin x>0\) throughout the first quadrant. Therefore, option C, Positive, is correct. Zero occurs on the x-axis at boundary angles such as 0 or \(\pi\), not inside the first quadrant. A negative sine value occurs in the third and fourth quadrants, while undefined is not the correct description for sine at ordinary first-quadrant angles.

Related tags

QuadrantsSignsSineSigns Of Trigonometric Functions In Different QuadrantsTrigonometric FunctionsMathematicsClass 12 Mcq

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