If \(\sin \theta = \frac{3}{5}\) and \(\cos \theta < 0\), then the value of \(\tan \theta\) is
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Remember the "ASTC" rule: All (Q1), Sine (Q2), Tan (Q3), Cosine (Q4) are positive. If Sine is positive and Cosine is negative, you are in Q2, where only Sine is positive. So Tan must be negative.