Application of Itô's formula

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Let $(W)_{t\ge0}$ and $(B)_{t\ge0}$ be independent Brownian motions.

Consider $X_t=\exp(-W_t)\left(x_0+\int_0^t\exp(W_s)dB_s\right)$.

Can anyone explain to me how to obtain

$dX_t=dB_t+X_t\left(\frac{1}{2}dt-dW_t\right)$

via Itô's formula?