Well heres an example of what is happening (i'm not too good at laying out my maths):

Its cos

Adj = 4

Hyp = 10

Cos x = 4 ÷ 10

X= cos(-1) 0.4

The answer should be 66.4 but on my casio casio s-v.p.a.m it says 0.99997563

what am i doing wrong?

heres a link to the calculator if it helps

http://www.sprinterservis.cz/darky/i...ator_casio.jpg