OpenStax, Precalculus 2e §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 3 · Trigonometry · Compound & multiple angles

Using the Double-Angle Formulas to Establish an Identity

Establish the following identity using double-angle formulas:

$1 + s in (2 θ) = (s in θ + cos θ)^{2}$

~5 minWritten answer · compare with the solution

OpenStax, Precalculus 2e · §7.3 Double-Angle, Half-Angle, and Reduction Formulas · Example 3

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