A-Level Maths: E5-02 [Trigonometric Identities: Proving sin^2 θ + cos^2 θ = 1]

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We really need to prove this however for all values of r, not just r=1. ie. (r sin theta)^2 + (r cos theta)^2 = r^2. Expand brackets and divide through by r^2 to get the identity.

louisehulks