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Let $R$ be the triangle in the $xy$ – plane bounded by the $x$-axis, the line $y=x$, and the line $x=1$. The value of the double integral $$\int \int_R \frac{\sin x}{x}\: dxdy$$ is

1. $1-\cos 1$
2. $\cos 1$
3. $\frac{\pi}{2}$
4. $\pi$
in Calculus
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