求下列函数的导数:y=x-sin x/2 cos x/2 y=x^3+3^x

y=x-sin x/2 cos x/2
y=x - sin(x/2)cos(x/2) = x-(1/2)sinx
dy/dx=1 - (1/2)cosx
y=x^3+3^x
y=x^3+3^x ,y'=3x^2+3^xln3