Exact values of trig functions for special angles.
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cos180⁰
-1
cos270⁰
0
cos90⁰
0
sin0⁰
0
sin180⁰
0
sin360⁰
0
tan0⁰
0
tan180⁰
0
tan360⁰
0
cos0⁰
1
cos360⁰
1
sin90⁰
1
tan45°
1
sin30°
1/2
sin270⁰
undefined
tan270⁰
undefined
tan90⁰
undefined
