Question

1-sin^2 x=?

sin^2 x-1=?

Answer 1

1-sin^2 x=cos^2 x

sin^2 x-1=sin^2 x-(sin^2 x+cos^2x)=-cos^2x

Answer 2

1-sin^2 x=cos^2x

sin^2 x-1=-cos^2x