Find dy/dx y=cos(x+y)

Math
Differentiate both sides of the equation.
The derivative of with respect to is .
Differentiate the right side of the equation.
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Differentiate using the chain rule, which states that is where and .
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To apply the Chain Rule, set as .
The derivative of with respect to is .
Replace all occurrences of with .
Differentiate.
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By the Sum Rule, the derivative of with respect to is .
Differentiate using the Power Rule which states that is where .
Rewrite as .
Reform the equation by setting the left side equal to the right side.
Solve for .
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Simplify .
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Apply the distributive property.
Simplify the expression.
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Multiply by .
Reorder factors in .
Add to both sides of the equation.
Factor out of .
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Factor out of .
Factor out of .
Factor out of .
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Move the negative in front of the fraction.
Replace with .
Find dy/dx y=cos(x+y)

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