验证y1=cosωx及y2=sinωx都是方程y"+ω2y=0的解,并写出该方程的通解
验证y1=cosωx及y2=sinωx都是方程y"+ω2y=0的解,并写出该方程的通解。
验证y1=cosωx及y2=sinωx都是方程y"+ω2y=0的解,并写出该方程的通解。
A.clear x=-pi:0.1:pi; y1=sin(x); y2=cos(x); y3=log(x+2*pi); plot(x,y1,'r',x,y2,'g',x,y3,'b')
B.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
C.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
D.clear x=-pi:0.1:pi; y=sin(x); y=cos(x); y=log(x+2*pi); plot(x,y,'r',x,y,'g',x,y,'b')
E.clear x=-2*pi:0.1:2*pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
F.clear x=-2*pi:0.1:2*pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=log(x+2*pi); plot(x,y3,'b')
A.clear x=-pi:0.1:pi; y1=sin(x); y2=cos(x); y3=tan(x); plot(x,y1,'r',x,y2,'g',x,y3,'b')
B.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=tan(x); plot(x,y3,'b')
C.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=tan(x); plot(x,y3,'b')
D.clear x=-pi:0.1:pi; y1=sin(x); plot(x,y1,'r') y2=cos(x); plot(x,y2,'g') y3=tan(x); plot(x,y3,'b')
E.clear x=-pi:0.1:pi; y=sin(x); y=cos(x); y=tan(x); plot(x,y,'r',x,y,'g',x,y,'b')
F.clear x=-2*pi:0.1:2*pi; y1=sin(x); plot(x,y1,'r') hold on y2=cos(x); plot(x,y2,'g') y3=tan(x); plot(x,y3,'b')
t=0:0.1:10
y1=sin(t);y2=cos(t);
plot(t,y1,'r',t,y2,'b=');
x=[1.7*pi;1.6*pi];
y=[-0.3;0.8];
s=['sin(t)';'cos(t)'];
text(x,y,s);
title('正弦和余弦曲线');
legend('正弦','余弦')
xlabel('时间t'),ylabel('正弦、余弦')
grid on
axis square
验证y1=COS 23"及Y2=sin 2x都是方程y”+4y=0的解,并写出该方程的通解.
A.3
B.4
C.5
D.6
y2(xdx+ydy)+x(ydx-xdy)=0(提示:令x=ρcosθ,y=ρsinθ).
A、clear syms x y=(sin(1+log(x)))^2 y2=diff(y,x,2)
B、clear syms x y=sin(1+log(x))^2 diff(y,x,2)
C、clear syms x y=sin(1+log(x)^2) y2=diff(y,x,2)
D、clear syms x y=sin(1+log(x))^2 y2=diff(y,x)
E、clear syms x y=(sin(1+log(x)))^2 y2=diff(diff(y,x),x)
F、clear syms x y=(sin(1+log(x)))^2 y1=diff(y,x) y2=diff(y1,x)
A、clear syms x y=(sin(1+log(x)))^2 y2=diff(y,x,2)
B、clear syms x y=sin(1+log(x))^2 diff(y,x,2)
C、clear syms x y=sin(1+log(x)^2) y2=diff(y,x,2)
D、clear syms x y=sin(1+log(x))^2 y2=diff(y,x)
E、clear syms x y=(sin(1+log(x)))^2 y2=diff(diff(y,x),x)
F、clear syms x y=(sin(1+log(x)))^2 y1=diff(y,x) y2=diff(y1,x)
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