I can't find cossine.

It’s working well for Sine but not Cossine:

   print ("Sin "+Mathf.Sin(89 * Mathf.PI / 180));
   print ("Cossine"+Mathf.Cos(89 * Mathf.PI / 180));
   print ("Sin "+Mathf.Sin(90 * Mathf.PI / 180));
   print ("Cossine"+Mathf.Cos(90 * Mathf.PI / 180));        
   print ("Sin "+Mathf.Sin(91 * Mathf.PI / 180));
   print ("Cossine"+Mathf.Cos(91 * Mathf.PI / 180));

Sin 0.9998477 Cossine 0.01745238 Sin 1 Cossine -4.371139E-08 Sin 0.9998477 Cossine -0.01745247

Thanks.

The correct way to read -4.371139E-08 is -0.00000004371139. That is as close to zero as makes no difference.

There is also no such thing as cossine. The correct term is cosine.

Closing this question before you embarrass yourself any further.