Question
Rewrite the quantity as algebraic expressions of $x$ and state the domain on which the equivalence is valid.$$\sin (2 \arccos (x))$$
Step 1
We know that $\sin(2\theta) = 2\sin(\theta)\cos(\theta)$. So, we can rewrite the given expression as $2\sin(\arccos(x))\cos(\arccos(x))$. Show more…
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