练习:A= cos(A) tan(A) exp(A) log(A) log10(A) sqrt(A) a=[-601-4492500.990.992.504496.01] ound(a floor(a) (2)向量函数练习：       = 4 6 1 2 A ，cos(A) tan(A) exp(A) 1og(A) log10(A) sqrt(A) a=[-6.01 -4.49 -2.50 -0.99 0.99 2.50 4.49 6.01] round(a) floor(a) ceil(a) （2）向量函数