For the following exercises, algebraically determine whether each of the given expressions is a true identity. If
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For the following exercises, algebraically determine whether each of the given expressions is a true identity. If it is not an identity, replace the right-hand side with an expression equivalent to the left side. Verify the results by graphing both expressions on a calculator.
2cos(2x)cos x + sin(2x)sin x = 2 sin x
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