Ononot — Given \sin^4 \theta + \cos^4 \theta = k, what is the express

Guest Session: 1 Question Remaining. Create Account to save progress.

Trigonometryhard

0:00.0

Given $\sin^4 \theta + \cos^4 \theta = k$ , what is the expression for $\cos(4\theta)$ in terms of $k$ ?