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Find a cofunction with the same value as the given expression. \[ \begin{array}{r} \cos \left(\fra ...
Find a cofunction with the same value as the given expression. \[ \begin{array}{r} \cos \left(\frac{5 \pi}{6}+x\right) \\ \cos \left(\frac{\pi}{2}+\theta\right) \end{array} \]