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Find dy/dx of the equation sin(x2y3) + 3x3y2 = 6 using implicit differentiation.

Mathematics

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Step 1: Differentiate both sides of the equation with respect to xx.
The given equation is sin⁡(x2y3)+3x3y2=6\sin(x^2y^3) + 3x^3y^2 = 6.
We apply the derivative operator ddx\frac{d}{dx} to both sides:

ddx(sin⁡(x2y3))+ddx(3x3y2)=ddx(6)\frac{d}{dx}(\sin(x^2y^3)) + \frac{d}{dx}(3x^3y^2) = \frac{d}{dx}(6)

Step 2: Differentiate each term.
For the first term, ddx(sin⁡(x2y3))\frac{d}{dx}(\sin(x^2y^3)), we use the chain rule. Let u=x2y3u = x^2y^3.
Then ddx(sin⁡(u))=cos⁡(u)dudx\frac{d}{dx}(\sin(u)) = \cos(u) \frac{du}{dx}.
To find dudx=ddx(x2y3)\frac{du}{dx} = \frac{d}{dx}(x^2y^3), we use the product rule, where f=x2f = x^2 and g=y3g = y^3.
dfdx=2x\frac{df}{dx} = 2x.
dgdx=3y2dydx\frac{dg}{dx} = 3y^2 \frac{dy}{dx} (using the chain rule for y3y^3).
So, dudx=(2x)(y3)+(x2)(3y2dydx)=2xy3+3x2y2dydx\frac{du}{dx} = (2x)(y^3) + (x^2)(3y^2 \frac{dy}{dx}) = 2xy^3 + 3x^2y^2 \frac{dy}{dx}.
Therefore, ddx(sin⁡(x2y3))=cos⁡(x2y3)(2xy3+3x2y2dydx)\frac{d}{dx}(\sin(x^2y^3)) = \cos(x^2y^3) (2xy^3 + 3x^2y^2 \frac{dy}{dx}).

For the second term, ddx(3x3y2)\frac{d}{dx}(3x^3y^2), we use the product rule, where f=3x3f = 3x^3 and g=y2g = y^2.
dfdx=9x2\frac{df}{dx} = 9x^2.
dgdx=2ydydx\frac{dg}{dx} = 2y \frac{dy}{dx} (using the chain rule for y2y^2).
So, ddx(3x3y2)=(9x2)(y2)+(3x3)(2ydydx)=9x2y2+6x3ydydx\frac{d}{dx}(3x^3y^2) = (9x^2)(y^2) + (3x^3)(2y \frac{dy}{dx}) = 9x^2y^2 + 6x^3y \frac{dy}{dx}.

For the right side, ddx(6)=0\frac{d}{dx}(6) = 0.

Step 3: Substitute the differentiated terms back into the equation.

cos⁡(x2y3)(2xy3+3x2y2dydx)+9x2y2+6x3ydydx=0\cos(x^2y^3) (2xy^3 + 3x^2y^2 \frac{dy}{dx}) + 9x^2y^2 + 6x^3y \frac{dy}{dx} = 0

Step 4: Expand and rearrange the equation to isolate dydx\frac{dy}{dx}.

2xy3cos⁡(x2y3)+3x2y2cos⁡(x2y3)dydx+9x2y2+6x3ydydx=02xy^3 \cos(x^2y^3) + 3x^2y^2 \cos(x^2y^3) \frac{dy}{dx} + 9x^2y^2 + 6x^3y \frac{dy}{dx} = 0

Group terms containing dydx\frac{dy}{dx} on one side and other terms on the other side:

3x2y2cos⁡(x2y3)dydx+6x3ydydx=−2xy3cos⁡(x2y3)−9x2y23x^2y^2 \cos(x^2y^3) \frac{dy}{dx} + 6x^3y \frac{dy}{dx} = -2xy^3 \cos(x^2y^3) - 9x^2y^2

Factor out dydx\frac{dy}{dx}:

dydx(3x2y2cos⁡(x2y3)+6x3y)=−2xy3cos⁡(x2y3)−9x2y2\frac{dy}{dx} (3x^2y^2 \cos(x^2y^3) + 6x^3y) = -2xy^3 \cos(x^2y^3) - 9x^2y^2

Step 5: Solve for dydx\frac{dy}{dx}.

dydx=−2xy3cos⁡(x2y3)−9x2y23x2y2cos⁡(x2y3)+6x3y\frac{dy}{dx} = \frac{-2xy^3 \cos(x^2y^3) - 9x^2y^2}{3x^2y^2 \cos(x^2y^3) + 6x^3y}

Step 6: Simplify the expression by factoring common terms from the numerator and denominator.
Factor out −xy2-xy^2 from the numerator:
Numerator =−xy2(2ycos⁡(x2y3)+9x)= -xy^2 (2y \cos(x^2y^3) + 9x).
Factor out 3xy3xy from the denominator:
Denominator =3xy(xycos⁡(x2y3)+2x2)= 3xy (xy \cos(x^2y^3) + 2x^2).
Substitute these back into the expression for dydx\frac{dy}{dx}:

dydx=−xy2(2ycos⁡(x2y3)+9x)3xy(xycos⁡(x2y3)+2x2)\frac{dy}{dx} = \frac{-xy^2 (2y \cos(x^2y^3) + 9x)}{3xy (xy \cos(x^2y^3) + 2x^2)}

Assuming x≠0x \neq 0 and y≠0y \neq 0, we can cancel xyxy from the numerator and denominator:

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