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Sin 90 degrees equal to 1 but why?

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What does sin(90°)=1 mean? - Quora

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How is “sin (-310) =- sin 310”? I mean -310 is in the 1st quadrant

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Prove that sin(90-A) cos(90-A) = tanA / 1 + tan²A - Maths - Trigonometric Functions - 2983616

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