# Happy Birthday, Mehul!

**Calculus**Level 3

\[\large\int\limits_{1}^{15} e^x\sinh(x) \,\mathrm dx\]

If the above integral has a closed form: \(\dfrac{a-e^b+e^c}{d}\) for some integers \(a,b,c,d\) where \(a<0\) , then find the value of \(a+b+c+d\) .

**Clarification:** \(e\) denotes the Euler's number, \(e \approx 2.71828 \).