Why does the trigonometric function change at 90 and 270 degrees

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Why does the trigonometric function change at 90 and 270 degrees? Like sin to cos, tan to cot : r/JEENEETards

Why are trigonometric functions changed at 90 degrees and 270 degrees? - Quora

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Why are trigonometric functions changed at 90 degrees and 270 degrees? - Quora

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