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Sagot :
Given that angle θ1 is located in Quadrant II; and
[tex]\cos (\theta_1)=-\frac{12}{19}[/tex]Recall from trigonometric identity:
[tex]\begin{gathered} \cos \theta=\frac{\text{Adjacent}}{\text{Hypotenuse}} \\ \implies\text{Adjacent}=-12 \\ \text{Hypotenuse}=19 \end{gathered}[/tex]We find the value of Opposite using the Pythagoras theorem.
[tex]\begin{gathered} \text{Hyp}^2=\text{Opp}^2+\text{Adj}^2 \\ 19^2=\text{Opp}^2+(-12)^2 \\ \text{Opp}^2=19^2-(-12)^2 \\ \text{Opp}^2=361-144 \\ \text{Opp}^2=217 \\ \text{Opp}=\sqrt[]{217} \end{gathered}[/tex]Therefore, the value of sin(θ1) will be:
[tex]\begin{gathered} \sin (\theta_1)=\frac{\text{Opposite}}{\text{Hypotenuse}} \\ =\frac{\sqrt[]{217}}{19} \end{gathered}[/tex]Note: Sine is positive in Quadrant II.
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