Easy
The angle θ1\theta_1θ1 is located in Quadrant IV and cos(θ1)=919\cos (\theta_1)=\frac{9}{19}cos(θ1)=199. What is the value of sin(θ1)\sin ({\theta_1})sin(θ1) ?
−27019\frac{-2 \sqrt{70}}{19}19−2√70
27019\frac{2 \sqrt{70}}{19}192√70
±27019 \pm \frac{2 \sqrt{70}}{19}±192√70
719\frac{\sqrt{7}}{19}19√7
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