If (d / dx) (ɸ (x)) = f (x), then ∫12 f (x) dx =

1) f (1) – f (2)

2) ∅ (1) – ∅ (2)

3) f (2) – f (1)

4) ∅ (2) – ∅ (1)

Solution: (4) ∅ (2) – ∅ (1)

\(\begin{array}{l}\begin{array}{l} \text { Given }\\ \begin{array}{l} \frac{d \emptyset(x)}{d x}=f(x) \\ \text { Now, } \left. \int_{1}^{2} f(x)=\emptyset(x)\right]_{1}^{2} \\ =\emptyset(2)-\emptyset(1) \end{array} \end{array}\end{array} \)

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