Question

Cum sa aduci la o foma mai simpla expresia 1-4sin2a*cos2a/ cos2a- sin2a    URGENT!!!! DAU FUNDA!!!

Answer 1

$\frac{1-4 sin^{2}x cos^{2}x }{ cos^{2} x- sin^{2}x } = \frac{1- (2sinx*cosx)^{2} }{cos2x} = \frac{1- sin^{2} 2x}{cos2x} = \frac{ cos^{2}2x }{cos2x} =cos2x$