Please help me!Which of the following options is a Pythagorean Identity? A. (sin(x) - cos(x))^2 = 1 + 2sin(x)cos(x)B. (sin(x) - cos (x))^2 = 1C. (sin(x) - cos (x))^2 = 1 - 2sin(x)cos(x)D. sin^2(x) - cos^2(x) = 1

The answer is D. Think of the Pythagorean Theorem which states that a^2 + b^2 = c^2. The Pythagorean Identities used in trigonometry are the angle version which can be used to simplify expressions.