Just thought I'd add to what Melanie, Dwayne and the other smart folks who always give so much of their time and experience to us here have added...

Melanie gave the series formula for calculating sin(x)...here are a few others...(remember, x is in radians)

sin (x)= x - (x^3/3!) + (x^5/5!) - (x^7/7!) + (x^9/9!) ...

cos (x)= 1 - (x^2/2!) + (x^4/4!) - (x^6/6!) + (x^8/8!) ...

tan (x) = x + (x^3/3) + (2x^5/15) + (17x^7/315) ...

sinh (x)= x + (x^3/3!) + (x^5/5!) + (x^7/7!) + (x^9/9!) ...

cosh (x)= 1 + (x^2/2!) + (x^4/4!) + (x^6/6!) + (x^8/8!) ...

e^x = 1 + x + (x^2/2!) + (x^3/3!) + (x^4/4!) + ...

log (x) = 2[((x-1)/x+1)) + 1/3((x-1|)/(x+1))^3 + 1/5((x-1)/(x+1))^5+...]

Well, good luck...

Carl