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penfila11Pen
Hey there :)

h ( x ) = f [ g ( x ) ]

To find h ' ( x ) 
We do → f ' [ g ( x ) ] × g ' ( x ) 
This is called the chain rule

Given;
g ( 1 ) = 2  →  f ' ( 2 ) = 5
g ' ( 1 ) = 6

Apply the formula
h ' ( 1 ) = f ' [ g ( 1 ) ] × g ' ( 1 )
           = f ' ( 2 ) × 6
           = 5 × 6
h ' ( 1 ) = 30
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