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

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6. sin150 Sin(90+60)​=+cos60∘=+1/2 sin(180−30)=+sin30∘+1/2

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Why sin 90 is 1? When the reference angle becomes 90 and the