The value of sin 72⁰/cos 18⁰
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LHS = (sin72° + cos18°)(sin72° − cos18°) =(sin2 72° – cos2 18°) = (sin2 72° – cos2 (90° – 72°)) = sin2 72° – sin2 72° = 0 = RHSRead more on Sarthaks.com - https://www.sarthaks.com/711973/prove-that-sin-72-cos-18-sin-72-cos-18-0?show=711976#a711976
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