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