1.

If Cos(y)=Cos(-1) (y) then?

A. (1 – y2)(1 – Cos2 (y))=1
B. (1 – y2)(1 – Cos(y))=1
C. (1 – y2)(1 – Sin2 (y))=1
D. (1 – y2)(1 – Sin(y))=1
Answer» B. (1 – y2)(1 – Cos(y))=1


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