函数y=cos(3x+2)的导数是( )
A: -3sin(3x+2)
B: 3sin(3x+2)
C: sin(3x+2)
D: -sin(3x+2)
A: -3sin(3x+2)
B: 3sin(3x+2)
C: sin(3x+2)
D: -sin(3x+2)
举一反三
- 1802fa0b3e3fac1.png,求y的一阶导数 A: 3sin^2(x/3) B: sin^2(x/3) C: 3sin^2(x/3)cos(x/3) D: sin^(x/3)cos(x/3)
- 求微分方程[img=634x60]17da653955cf9e7.png[/img]的特解。 ( ) A: sin(2*x)/3 - cos(x) - cos(x)/3 B: sin(2*x)/3 - cos(x) - sin(x)/3 C: cos(2*x)/3 - cos(x) - sin(x)/3 D: sin(2*x)/3 - sin(x) - sin(x)/3
- 对于数学表达式,正确的C语言表达式是() A: 2sqrt(x)+(a+b)/3sin(x) B: 2sqrt(x)+(a+b)/(3sin(x)) C: 2*sqrt(x)+(a+b)/3/sin(x) D: 2*sqrt(x)+(a+b/3*sin(x))
- 对于数学表达式2x+(a+b)÷3sinx,对应的C表达式是() A: 2x+(a+b)/3sin(x) B: 2x+(a+b)/(3sin(x)) C: 2*x+(a+b)/3/sin(x) D: 2*x+(a+b/3/sin(x))
- 常微分方程[img=243x26]1802e4d57c1aad8.png[/img]的解为: A: exp(-x)*sin(3^(1/2)*x)*C2+exp(-x)*cos(3^(1/2)*x)*C1-1/4*cos(2*x),C1、C2为任意常数 B: exp(-2x)*cos(3^(1/2)*x)*C2+exp(-2x)*cos(3^(1/2)*x)*C1-1/4*sin(2*x),C1、C2为任意常数 C: exp(-3x)*sin(3^(1/2)*x)*C2+exp(-3x)*sin(3^(1/2)*x)*C1-1/4*sin(2*x),C1、C2为任意常数 D: exp(-4x)*sin(3^(1/2)*x)*C2-exp(-4x)*cos(3^(1/2)*x)*C1-1/4*cos(2*x),C1、C2为任意常数