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CBSE Class 12 Math 2008 Solved Paper

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Question : 1
Total: 29
If f(x) = x + 7 and g(x) = x – 7, x ∊ R, find (fog) (7)
Solution:  
fog(x) = f{g(x)}
= f (x – 7)
= {(x – 7) + 7}
= x
∴ fog (7) = 7
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