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(16)
x=t^2/2
dx/dt =t
y=1-t^3
dy/dt = -3t^2
dy/dx
=(dy/dt)/(dx/dt)
=-3t
(17)
y=dy/dx
∫dy/y = ∫dx
ln|y| = x +C'
y= C.e^x
(19)
|sinx|≤1 and lim(x->+无穷) 1/x =0
=>
lim(x->+无穷) sinx/x =0
(20)
y=f(x^3)
y'
=f'(x^3) .(x^3)'
=f'(x^3) .(3x^2)
=3x^2.f'(x^3)
x=t^2/2
dx/dt =t
y=1-t^3
dy/dt = -3t^2
dy/dx
=(dy/dt)/(dx/dt)
=-3t
(17)
y=dy/dx
∫dy/y = ∫dx
ln|y| = x +C'
y= C.e^x
(19)
|sinx|≤1 and lim(x->+无穷) 1/x =0
=>
lim(x->+无穷) sinx/x =0
(20)
y=f(x^3)
y'
=f'(x^3) .(x^3)'
=f'(x^3) .(3x^2)
=3x^2.f'(x^3)
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