Question

necesito resuelto (1+cosx)(1-cosx)=sen2x

Answer 1

$(1+cosx)(1-cosx)=sen^{2} x$

$1 - cos^{2}x =sen^{2} x$

$sen^{2} x =sen^{2} x$



Nota

$sen ^{2}x + cos ^{2}x = 1$

$sen ^{2}x = 1 - cos ^{2}x$