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What is the sign of (\tan x) in the third quadrant?

Answer and explanation

Correct answer: Positive

The correct answer is option C: positive. In the third quadrant, both sine and cosine are negative. Since \\(\tan x=\frac{\sin x}{\cos x}\\), the quotient of two negative numbers is positive. Therefore tangent is positive in the third quadrant. Option A, negative, is wrong because it would result when sine and cosine have opposite signs, as in the second or fourth quadrant. Option B, zero, occurs on axes at angles where sine is zero, not throughout the third quadrant. Option C is correct because negative divided by negative is positive. Option D, undefined, occurs where \\(\cos x=0\\), mainly on the vertical axis, not for ordinary angles inside the third quadrant. The sign pattern is remembered by ASTC: All, Sine, Tangent, Cosine; tangent is positive in quadrant III.

Related tags

QuadrantsSignsTangent

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