four *(three *sin(x)^ two + cos(x)^ two)*cos(x)^ two = zero
4 multiply by (3 multiply by sinus of (x) squared plus 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 plus 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