Geometry

Pythagorean Identities

Basic Proving Identities using Pythagorean Theorem

         

Which of the following is equal to 1cos2θ?1-\cos^2\theta?

Which of the following is equal to 1sin2θ?1-\sin^2\theta?

Which of the following is equal to (1cosθ)(1+cosθ)?(1-\cos\theta)(1+\cos\theta)?

Which of the following is equal to (sinθ1)(sinθ+1)?(\sin\theta-1)(\sin\theta+1)?

Which of the following is equal to sec2θtan2θ+1?\dfrac{\sec^2\theta}{\tan^2\theta+1}?

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