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In David Bohm,s Quantum Theory, in chapter 3 section 2(motion of pulse of light)

There is this equation, I could not understand how, integrating LHS produced a sin.

Please help.

note:

LHS: k_{0}+Δk is super script. I did not know how to put it closer to integration sign.

E_{x}(x)= ∫_{k0-Δk}^{k0+Δk}dke^{ik(x-x0)}= 2 ((sin Δk (x-x_{0})) / (x-x_{0})) e^{ik0(x-x0)}

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# Wave packet: math question. QT(Bohm's book)

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