What is the integral of cos(x)e^{-sx} ?

The integral of cos(x)e^{-sx} is (e^{-sx}sin(x))/(1+s^2)-(se^{-sx}cos(x))/(1+s^2)+C

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integral of cos(x)e^{-sx}

\int cos (x) e^{- s x} d x

\frac{e ^{- s x} sin ( x )}{1 + s ^{2}} - \frac{s e ^{- s x} cos ( x )}{1 + s ^{2}} + C

Solution steps

\int cos (x) e^{- s x} d x

Apply Integration By Parts

: e^{- s x} sin (x) - \int - s e^{- s x} sin (x) d x

= e^{- s x} sin (x) - \int - s e^{- s x} sin (x) d x

Take the constant out:

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

= e^{- s x} sin (x) - (- s \cdot \int e^{- s x} sin (x) d x)

Apply Integration By Parts

: - e^{- s x} cos (x) - \int s e^{- s x} cos (x) d x

= e^{- s x} sin (x) - (- s (- e^{- s x} cos (x) - \int s e^{- s x} cos (x) d x))

Take the constant out:

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

= e^{- s x} sin (x) - (- s (- e^{- s x} cos (x) - s \cdot \int e^{- s x} cos (x) d x))

Therefore

\int e^{- s x} cos (x) d x = e^{- s x} sin (x) - (- s (- e^{- s x} cos (x) - s \cdot \int e^{- s x} cos (x) d x))

Isolate

\int e^{- s x} cos (x) d x

= \frac{e ^{- s x} sin ( x )}{1 + s ^{2}} - \frac{s e ^{- s x} cos ( x )}{1 + s ^{2}}

Add a constant to the solution

= \frac{e ^{- s x} sin ( x )}{1 + s ^{2}} - \frac{s e ^{- s x} cos ( x )}{1 + s ^{2}} + C

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y^{2} - x y - 10 = 0, (- 3, - 5)

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What is the integral of cos(x)e^{-sx} ?
The integral of cos(x)e^{-sx} is (e^{-sx}sin(x))/(1+s^2)-(se^{-sx}cos(x))/(1+s^2)+C