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4. Five point Forward difference, Central difference formula numerical differentiation example ( Enter your problem )
  1. Formula & Example-1 (table data)
  2. Example-2 (table data)
  3. Example-3 (`f(x)=cosx`)
  4. Example-4 (`f(x)=2x^3+x^2-4`)
  5. Example-5 (`f(x)=xlnx`)
  6. Example-6 (`f(x)=sinx`)

2. Example-2 (table data)





Using Five point Forward difference, Backward difference, Central difference formula numerical differentiation to find solution
x11.051.101.151.201.251.30
f(x)11.024701.048811.072381.095451.118031.14018

`f^'(1.15) and f^('')(1.15)`


Solution:
The value of table for `x` and `y`

x11.051.11.151.21.251.3
y11.02471.04881.07241.09541.1181.1402

Five-point CDF (Central difference formula)
`f^'(x)=1/(12h)[f(x-2h)-8f(x-h)+8f(x+h)-f(x+2h)]`

`f^'(1.15)=1/(12*0.05)[f(1.15-2*0.05)-8f(1.15-0.05)+8f(1.15+0.05)-f(1.15+2*0.05)]`

`f^'(1.15)=1/0.6[f(1.05)-8f(1.1)+8f(1.2)-f(1.25)]`

`f^'(1.15)=1/0.6[1.0247-8(1.0488)+8(1.0954)-1.118]`

`f^'(1.15)=0.4663`



Five-point CDF (Central difference formula) for second derivatives
`f^('')(x)=1/(12h^2)[-f(x-2h)+16f(x-h)-30f(x)+16f(x+h)-f(x+2h)]`

`f^('')(1.15)=1/(12*(0.05)^2)[-f(1.15-2*0.05)+16f(1.15-0.05)-30f(1.15)+16f(1.15+0.05)-f(1.15+2*0.05)]`

`f^('')(1.15)=1/0.03[-f(1.05)+16f(1.1)-30f(1.15)+16f(1.2)-f(1.25)]`

`f^('')(1.15)=1/0.03[-1.0247+16(1.0488)-30(1.0724)+16(1.0954)-1.118]`

`f^('')(1.15)=-0.199`




This material is intended as a summary. Use your textbook for detail explanation.
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