`f'''(x) = cos(x), f(0) = 1, f'(0) = 2, f''(0) = 3` Find `f`.

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`f'''(x)=cos(x)`

`f''(x)=intcos(x)dx`

`f''(x)=sin(x)+C_1`

Now let's find C_1 , given f''(0)=3

`f''(0)=3=sin(0)+C_1`

`3=0+C_1`

`C_1=3`

`:.f''(x)=sin(x)+3`

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