Answer
$$\frac{10\tan \left(k+3\right)}{3}$$
Work Step by Step
Simplifying the expression using trigonometric identities, we find:
$$\frac{10\sin \left(k+3\right)}{3\cos \left(k+3\right)} \\ \frac{10\tan \left(k+3\right)}{3}$$
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