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Question 5 and 6, Exercise 8.1
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=-\sqrt{1-\dfrac{16}{25}}=\sqrt{\dfrac{9}{25}}\\ \Rightarrow \quad \cos \alpha&=-\dfrac{3}{5}.\end{align*} Als... } =-\dfrac{13}{12} \end{align*} \begin{align*} \Rightarrow \quad \cos \beta=\frac{1}{\sec \beta}=-\frac{12}{... }} =-\dfrac{17}{8} \end{align*} \begin{align*} \Rightarrow \quad \sin \beta=\frac{1}{\csc \beta}=-\frac{8}{1