OpenStax, Precalculus 2e §7.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 48 · Trigonometry · Compound & multiple angles

Sum-to-Product and Product-to-Sum Formulas · Exercise 48

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.

$\frac{s in ( 2 x ) + s in ( 4 x )}{s in ( 2 x ) - s in ( 4 x )} = - t an (3 x) co t x$

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OpenStax, Precalculus 2e · §7.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 48

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