We need to find $\cos \theta$. We know the identity between $\sin \theta$ and $\cos \theta$ is $\sin^2 \theta + \cos^2 \theta = 1$. We can substitute the value of $\sin \theta$ to get the value of $\cos \theta$.
So, we have $\left(\frac{3}{5}\right)^2 + \cos^2
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