Question

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Answer 1

\(\large h=7cos(\frac{\pi}{3t}) \)

\(\large \frac{h}{7}=cos(\frac{\pi}{3t}) \) , divide both sides by 7;

\(\large cos^{-1}(\frac{h}{7})=cos^{-1}[cos(\frac{\pi}{3t})] \) , take the inverse cosine of both sides;

\(\large t\cdot cos^{-1}(\frac{h}{7})=\frac{\pi}{3t} \cdot t \), multiply both sides by t;

\(\large t=\frac{\pi}{3\cdot cos^{-1}(\frac{h}{7})} \), divide both sides by \(\large cos^{-1}(\frac{h}{7}) \)