Ex 3 3 24 Prove Cos 4x 1 8 Sin2 X Cos 2 X Chapter 3
Support the channel via Patreon https//wwwpatreoncom/mathsacademy In this lesson I will show you how to show that cos^4x sin^4x = 1 2cos^2xStep 3 The cosine function is negative in the second and third quadrants To find the second solution, subtract the reference angle from to find the solution in the third quadrant Step 4
