1.

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

A. (1 – y<sup>2</sup> )(1 – Cos<sup>2</sup> (y))=1
B. (1 – y<sup>2</sup> )(1 – Cos(y))=1
C. (1 – y<sup>2</sup> )(1 – Sin<sup>2</sup> (y))=1
D. (1 – y<sup>2</sup> )(1 – Sin(y))=1
Answer» B. (1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® y<sup>2</sup> )(1 ‚Äö√Ñ√∂‚àö√ë‚àö¬® Cos(y))=1


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