Question
Find the requested information.Given that $\sin a=\frac{2}{3}$ and $\cos b=-\frac{1}{4},$ with $a$ and $b$ both in the interval $\left[\frac{\pi}{2}, \pi\right),$ find $\sin (a+b)$ and $\cos (a-b)$.
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We are also given that $a$ and $b$ are both in the interval $\left[\frac{\pi}{2}, \pi\right)$. Show more…
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