OpenStax, Algebra and Trigonometry 2e §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 63 · Trigonometry · Compound & multiple angles

Sum-to-Product and Product-to-Sum Formulas · Exercise 63

Prove the identity.

$t an (\frac{π}{4} - t) = \frac{1 - t an t}{1 + t an t}$

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OpenStax, Algebra and Trigonometry 2e · §9.4 Sum-to-Product and Product-to-Sum Formulas · Exercise 63

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