cos(x)*cos(x/2)*cos(x/4)*cos(x/8).cos(x/(2^(n-1))
cos(x)*cos(x/2)*cos(x/4)*cos(x/8).cos(x/(2^(n-1))
sin(α-β)cosβ+cos(α-β)sinβ=( ) A: sin(α-2β) B: cos(α-2β) C: sinα D: cosα
sin(α-β)cosβ+cos(α-β)sinβ=( ) A: sin(α-2β) B: cos(α-2β) C: sinα D: cosα
已知向量a=(2,2,1),则a的方向余弦为(). A: cosα=2/3,cosβ=2/3,cosγ=1/3 B: cosα=2/5,cosβ=2/5,cosγ=1/5
已知向量a=(2,2,1),则a的方向余弦为(). A: cosα=2/3,cosβ=2/3,cosγ=1/3 B: cosα=2/5,cosβ=2/5,cosγ=1/5
机器人中推导数学公式时的简写符合c12表示( )。 A: cos(ϴ1×ϴ2) B: cos(ϴ1+ ϴ2) C: cos(ϴ1)+ cos(ϴ2) D: cos(ϴ1)×cos(ϴ2)
机器人中推导数学公式时的简写符合c12表示( )。 A: cos(ϴ1×ϴ2) B: cos(ϴ1+ ϴ2) C: cos(ϴ1)+ cos(ϴ2) D: cos(ϴ1)×cos(ϴ2)
画出单位圆点列图 A: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2}]] B: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2},AspectRatio → Automatic]] C: ListPlot[Table[{Cos[x], Sin[x]},{x,0,2Pi,0.2}],AspectRatio → Automatic] D: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2}], Joined→True]
画出单位圆点列图 A: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2}]] B: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2},AspectRatio → Automatic]] C: ListPlot[Table[{Cos[x], Sin[x]},{x,0,2Pi,0.2}],AspectRatio → Automatic] D: ListPlot[Table[{Cos[x],Sin[x]},{x,0,2Pi,0.2}], Joined→True]
一平面简谐机械波沿x轴正方向传播,波动方程为y=0.2cos(πt-πx/2) m,则x = 1m处介质质点的振动加速度a的表达式为( )。 A: 0.2πcos(πt+π/2) B: 0.2π2cos (πt+π/2) C: -0.2π2cos (πt+π/2) D: -0.2π2sin (πt+π/2)
一平面简谐机械波沿x轴正方向传播,波动方程为y=0.2cos(πt-πx/2) m,则x = 1m处介质质点的振动加速度a的表达式为( )。 A: 0.2πcos(πt+π/2) B: 0.2π2cos (πt+π/2) C: -0.2π2cos (πt+π/2) D: -0.2π2sin (πt+π/2)
【单选题】设y=sin(cos(x)),求 结果为:(本题10.0分) A. cos(cos(x))*cos(x)+ sin(cos(x))*sin(x)^2 B. - cos(cos(x))*cos(x) - sin(cos(x))*sin(x)^2 C. - cos(cos(x))*cos(x)^2 - sin(cos(x))*sin(x)^2 D. - cos(cos(x))*cos(x) ^2- sin(cos(x))*sin(x)
【单选题】设y=sin(cos(x)),求 结果为:(本题10.0分) A. cos(cos(x))*cos(x)+ sin(cos(x))*sin(x)^2 B. - cos(cos(x))*cos(x) - sin(cos(x))*sin(x)^2 C. - cos(cos(x))*cos(x)^2 - sin(cos(x))*sin(x)^2 D. - cos(cos(x))*cos(x) ^2- sin(cos(x))*sin(x)
cos(2α)=cos^2(α)-sin^2(α)=2cos^2(α)-1=1-2sin^2(α)
cos(2α)=cos^2(α)-sin^2(α)=2cos^2(α)-1=1-2sin^2(α)
将数学表达式Cos A: Cos(a+b+5*exp(2) B: Cos (a+ C: +5*exp(2 D: Cos(a+b +5*ln(2) E: Cos (a+ F: +5*ln(2)
将数学表达式Cos A: Cos(a+b+5*exp(2) B: Cos (a+ C: +5*exp(2 D: Cos(a+b +5*ln(2) E: Cos (a+ F: +5*ln(2)
曲线积分$$\int_{(0,0}^{(x,y)}(2x\cos y-y^2\sin x)dx+(2y\cos x-x^2\sin y)dy=$$ A: $y^2\cos x+x^2\cos y$ B: $x^2\cos x+y^2\cos y$ C: $x^2\sin y+y^2\sin x$ D: $x^2\sin x+y^2\sin y$
曲线积分$$\int_{(0,0}^{(x,y)}(2x\cos y-y^2\sin x)dx+(2y\cos x-x^2\sin y)dy=$$ A: $y^2\cos x+x^2\cos y$ B: $x^2\cos x+y^2\cos y$ C: $x^2\sin y+y^2\sin x$ D: $x^2\sin x+y^2\sin y$