Q. Differentiate dxdy=ex+y with initial condition y(0)=−ln3
Write Differential Equation: Write down the given differential equation and initial condition.dxdy=ex+yInitial condition: y(0)=−ln(3)
Separate Variables: To solve the differential equation, we need to separate the variables x and y. We can do this by dividing both sides by ey and multiplying both sides by dx.eydy=exdx
Integrate Equations: Integrate both sides of the equation with respect to their respective variables.∫(ey1)dy=∫exdx
Apply Initial Condition: Perform the integration on both sides.The integral of ey1 with respect to y is −ey1, and the integral of ex with respect to x is ex.−ey1=ex+C, where C is the constant of integration.
Simplify Equation: Apply the initial condition to find the constant of integration C.y(0)=−ln(3) implies that when x=0, y=−ln(3).Substitute x=0 and y=−ln(3) into the integrated equation.−e−ln(3)1=e0+C
Find Constant: Simplify the equation using the properties of exponents and logarithms. eln(3)=3, so −31=1+C.
General Solution: Solve for C.C=−31−1C=−34
Solve for y: Write the general solution of the differential equation with the constant C.−ey1=ex−34
Check for Errors: To express y explicitly in terms of x, we need to solve for y. ey=−ex−343 Taking the natural logarithm of both sides gives us y. y=ln(−ex−343)
Check for Errors: To express y explicitly in terms of x, we need to solve for y.ey=−ex−343Taking the natural logarithm of both sides gives us y.y=ln(−ex−343)Check for any mathematical errors in the previous steps, especially in the algebraic manipulations and the application of the initial condition.
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