Question: Sin(45.0) and Cos(45.0) not = to .707

I must be too far gone, my maple 10 will not agree with my TI-89. When I type sin(45) and press enter I get sin(45). Perfect! When I type sin(45.0) I get 0.8509035245 and I am expecting (.70710679). Now when I type cos(45) I get cos(45). Perfect! When I type sin(45.0) I get 0.5253219888 and I am expecting (.70710679). For sin(0) I get 0, but sin(90.0) I get (0.893???)when I am expecting 1.00. Likewise cos(0) I get a 1, but cos(90.0) I get (−.4480736161) when I am expect a zero. I promise that I am not on the sauce. Can anyone help straighten me out?
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