OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 35 · Trigonometry · Compound & multiple angles

Double-Angle, Half-Angle, and Reduction Formulas · Exercise 35

Prove the given identity.

$s in (2 x) = - 2 s in (- x) cos (- x)$

~8 minWritten answer · compare with the solution

OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 35

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your working

Check your full solution

Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.