2 answers:
0.88294759285
cos28° = 0.88295
cos 28° = 0.88295
cos 28 degrees = 0.88295
In terms of the other five trigonometric functions, cos of 28° =
±
1
−
sin
2
28
∘
±
1
1
+
tan
2
28
∘
±
cot
28
∘
1
+
cot
2
28
∘
1
sec
28
∘
±
csc
2
28
∘
–
1
csc
28
∘
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