Determine the quadrant in which $\csc \theta > 0$ and $\sec \theta < 0$.

TrigonometryTrigonometric FunctionsQuadrantsSineCosineCosecantSecant
2025/5/1

1. Problem Description

Determine the quadrant in which cscθ>0\csc \theta > 0 and secθ<0\sec \theta < 0.

2. Solution Steps

Recall that cscθ=1sinθ\csc \theta = \frac{1}{\sin \theta} and secθ=1cosθ\sec \theta = \frac{1}{\cos \theta}. Therefore, the conditions cscθ>0\csc \theta > 0 and secθ<0\sec \theta < 0 are equivalent to sinθ>0\sin \theta > 0 and cosθ<0\cos \theta < 0.
We need to find the quadrant where sinθ\sin \theta is positive and cosθ\cos \theta is negative.
In Quadrant I, both sinθ\sin \theta and cosθ\cos \theta are positive.
In Quadrant II, sinθ\sin \theta is positive and cosθ\cos \theta is negative.
In Quadrant III, both sinθ\sin \theta and cosθ\cos \theta are negative.
In Quadrant IV, sinθ\sin \theta is negative and cosθ\cos \theta is positive.
Therefore, sinθ>0\sin \theta > 0 and cosθ<0\cos \theta < 0 in Quadrant II.

3. Final Answer

Quadrant 2.

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