Question

Use trigonometric identities to transform the left side of the equation into the right side (0 < θ < π/2).

sin2 θ − cos2 θ = sin2 θ − (_______)
= 2 sin2 θ − 1

Answer 1

To  transform the left side of the equation into the right side  under the interval (0 < θ < π/2), the missing trigonometric identity to complete the equation is cos2 θ = 1- sin2 θ. This is a trigonometric identity specifically under the Pythagorean Identities