Calculus Examples

Use the Limit Definition to Find the Derivative f(x)=1/( square root of x)
Step 1
Consider the limit definition of the derivative.
Step 2
Multiply by .
Step 3
Combine and simplify the denominator.
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Step 3.1
Multiply by .
Step 3.2
Raise to the power of .
Step 3.3
Raise to the power of .
Step 3.4
Use the power rule to combine exponents.
Step 3.5
Add and .
Step 3.6
Rewrite as .
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Step 3.6.1
Use to rewrite as .
Step 3.6.2
Apply the power rule and multiply exponents, .
Step 3.6.3
Combine and .
Step 3.6.4
Cancel the common factor of .
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Step 3.6.4.1
Cancel the common factor.
Step 3.6.4.2
Rewrite the expression.
Step 3.6.5
Simplify.
Step 4
Find the components of the definition.
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Step 4.1
Evaluate the function at .
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Step 4.1.1
Replace the variable with in the expression.
Step 4.1.2
The final answer is .
Step 4.2
Find the components of the definition.
Step 5
Plug in the components.
Step 6
Simplify.
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Step 6.1
Simplify the numerator.
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Step 6.1.1
To write as a fraction with a common denominator, multiply by .
Step 6.1.2
To write as a fraction with a common denominator, multiply by .
Step 6.1.3
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
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Step 6.1.3.1
Multiply by .
Step 6.1.3.2
Multiply by .
Step 6.1.3.3
Reorder the factors of .
Step 6.1.4
Combine the numerators over the common denominator.
Step 6.1.5
Rewrite in a factored form.
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Step 6.1.5.1
Use to rewrite as .
Step 6.1.5.2
Use to rewrite as .
Step 6.1.5.3
Apply the distributive property.
Step 6.1.5.4
Multiply by by adding the exponents.
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Step 6.1.5.4.1
Move .
Step 6.1.5.4.2
Multiply by .
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Step 6.1.5.4.2.1
Raise to the power of .
Step 6.1.5.4.2.2
Use the power rule to combine exponents.
Step 6.1.5.4.3
Write as a fraction with a common denominator.
Step 6.1.5.4.4
Combine the numerators over the common denominator.
Step 6.1.5.4.5
Add and .
Step 6.1.5.5
Rewrite in a factored form.
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Step 6.1.5.5.1
Factor out of .
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Step 6.1.5.5.1.1
Reorder and .
Step 6.1.5.5.1.2
Factor out of .
Step 6.1.5.5.1.3
Factor out of .
Step 6.1.5.5.1.4
Factor out of .
Step 6.1.5.5.1.5
Factor out of .
Step 6.1.5.5.1.6
Factor out of .
Step 6.1.5.5.2
Divide by .
Step 6.1.5.5.3
Simplify.
Step 6.1.5.6
Reduce the expression by cancelling the common factors.
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Step 6.1.5.6.1
Factor out of .
Step 6.1.5.6.2
Cancel the common factor.
Step 6.1.5.6.3
Rewrite the expression.
Step 6.1.6
Move to the denominator using the negative exponent rule .
Step 6.2
Multiply the numerator by the reciprocal of the denominator.
Step 6.3
Multiply by .
Step 6.4
Reorder factors in .
Step 7
Simplify the limit argument.
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Step 7.1
Convert fractional exponents to radicals.
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Step 7.1.1
Rewrite as .
Step 7.1.2
Rewrite as .
Step 7.1.3
Rewrite as .
Step 7.2
Combine using the product rule for radicals.
Step 8
Since the numerator is negative and the denominator approaches zero and is less than zero for near on both sides, the function increases without bound.
Step 9