, Δ, Δy y=f(x), 
, dy d(f(x)). , 
.
d= Δ. 
.
, y=f(x), 
dx.
:
- Δ
, 
. - :
.
1. 
x =π/4 dx=0,03.
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2. 
3.
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) 
x =2,01
) 
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) 
