\sin^4 x + \cos^4 x = 1 - 2 \left(\frac14 \sin^2 2x\right) = 1 - \frac12 \sin^2 2x - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$\sin^4 x + \cos^4 x = 1 - 2 \left(\frac{1}{4} \sin^2 2x\right) = 1 - \frac{1}{2} \sin^2 2x$