Open Question: If tan(theta) = 7/3 and sin(theta) < 0, then what is cos(theta)?
If tan ? = 7/3 and sin ? < 0, then ? is in Quadrant III.
If the opposite leg is -7 and the adjacent leg is -3, then the hypotenuse is v((-7)^2 + (-3)^2) = v58.
So cos ? = -3/v58 = -3v58/58.
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