- four *(sin(two *x)^ two /cos(two *x)^ two + one) = zero
minus 4 multiply by ( sinus of (2 multiply by x) squared divide by co sinus of e of (2 multiply by x) squared plus 1) equally 0
minus four multiply by ( sinus of (two multiply by x) to the power of two divide by co sinus of e of (two multiply by x) to the power of two plus one) equally zero
-4*(sin(2*x)2/cos(2*x)2 + 1) = 0
-4*sin2*x2/cos2*x2 + 1 = 0
-4*(sin(2*x)²/cos(2*x)² + 1) = 0
-4*(sin(2*x) to the power of 2/cos(2*x) to the power of 2 + 1) = 0