Answer :
Given;
Let (sin x - cos x) = t
⇒ (sin x + cos x )dx = dt
⇒When x = 0
⇒ t = 0 - 1
= - 1
= RHS
Hence Proved
OR
Given;
Here f(x) = 2x2+ 5x and a = 1, b = 3.
⇒ nh = 2;
i.e n→ ∞ ⇔ h→ 0
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