What is the integral of e^{-s*t} ?

The integral of e^{-s*t} is -1/s e^{-st}+C

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integral of e^{-s*t}

\int e^{- s \cdot t} d t

- \frac{1}{s} e^{- s t} + C

Solution steps

\int e^{- s t} d t

Apply u-substitution

: \int - \frac{e ^{u}}{s} d u

= \int - \frac{e ^{u}}{s} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - \frac{1}{s} \cdot \int e^{u} d u

Use the common integral:

\int e^{u} d u = e^{u}

= - \frac{1}{s} e^{u}

Substitute back

u = - s t

= - \frac{1}{s} e^{- s t}

Add a constant to the solution

= - \frac{1}{s} e^{- s t} + C

t^{2} y^{^{''}} + 2 t y^{^{'}} - 2 y = 0

\int \frac{4 x + 3}{2 x + 1} d x

y = x^{3} - 16 x + 2

\int r^{- 2} d r

x \to 0 + lim (\frac{e ^{x}}{ln ( x )})