four *(three *sin(x)^ two - cos(x)^ two)*cos(x)^ two = zero
4 multiply by (3 multiply by sinus of (x) squared minus co sinus of e of (x) squared ) multiply by co sinus of e of (x) squared equally 0
four multiply by (three multiply by sinus of (x) to the power of two minus co sinus of e of (x) to the power of two) multiply by co sinus of e of (x) to the power of two equally zero
4*(3*sin(x)2 - cos(x)2)*cos(x)2 = 0
4*3*sinx2 - cosx2*cosx2 = 0
4*(3*sin(x)² - cos(x)²)*cos(x)² = 0
4*(3*sin(x) to the power of 2 - cos(x) to the power of 2)*cos(x) to the power of 2 = 0