第3章矩阵、数组和符号运算 convert(exp) (1/2*exp(i*x)+1/2/exp(i*x))2+14*(exp(i*x}1exp(i*x)^2 convert(sincos) cos(xr2-sin(x)2 convert(tan) (1tan(1/2*x)^2)2/(1+tan(1/2*x)^2)2-4*tan(12*x)^2/(1+tan(12*x)2)^2 cos(xr2-sin(x)2 cos(2*x) >simplify(cos(x 2-Sin(x)2) aI ns *cos(x)2-1 >simplify(sin(x2+cos(x2)convert(exp): (1/2*exp(i*x)+1/2/exp(i*x))^2+1/4*(exp(i*x)-1/exp(i*x))^2 convert(sincos): cos(x)^2-sin(x)^2 convert(tan): (1-tan(1/2*x)^2)^2/(1+tan(1/2*x)^2)^2-4*tan(1/2*x)^2/(1+tan(1/2*x)^2)^2 collect(x): cos(x)^2-sin(x)^2 ans = cos(2*x) >> simplify(cos(x)^2-sin(x)^2) ans = 2*cos(x)^2-1 >> simplify(sin(x)^2+cos(x)^2) ans = 1 第3章 矩阵、数组和符号运算