3、 三,简答题1.(1)2*Cos(alfa)*Sin(alfa/(2*a)(2)Sqr(s*(s–a)*(s–b)*(s-c))(3)(A*A+B*C*(X+Y))/(A+B)(4)(2*3.14159*r+Exp(-5))*Log(x)(5)1/(x+1/(y+1))(6)k/(1+a*Exp(-b*x))(7)Cos(alfa)^2+Atn(alfa)(8)Sqr(y^3+3*(a*a+b*b)/(x*x+y*y))2.(1)(a+b)Modc(2)Sqr(Abs(x))(3)Int(x)+1(4)Int(Rnd*101)+200 3。 (1) F