Precalculus

Let $\mathcal{G}$ be the graph of the parametric equations
\begin{align*}
x &= \cos(4t),\\
y &= \sin(6t).
\end{align*}What is the length of the smallest interval $I$ such that the graph of these equations for all $t\in I$ produces the entire graph $\mathcal{G}$?

The answer is not pi. I have tried that, and it says it is wrong.

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asked by Zheng
  1. Hmmm. You're right. It's 2π/3

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    posted by Steve
  2. \pi/2 trust me 100% correct

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    posted by Helper
  3. It’s pi/2 trust him

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