Question

What is the value of cos 855

Answer 1

Cos855° = 0.883835172

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Answer 2

Answer:

-1/√2

Step-by-step explanation:

cos 855° = cos (720+135) , we have to take only last digit

take the 135 as 90 and 45

=> cos (90+45)

therefore cos 45° is -1/√2