cosign

\(cos(78) ≠ 0.207911690818\)

 

\(cos(78) ≈ -0.857803093245\)

 

\(cos(78°) ≈ 0.207911690818\)

.

cos(78) = 0.207911690818

Btw, cosine, not cosign.

Do you mean cos(78°) or do you mean cos(78) as in 78 radians?

 

If you mean cos(78°)...

 

\(cos(78°) ≈ 0.207911690818\)

 

If you mean cos(78)...

 

\(cos(78) ≈ -0.857803093245\)