sqrt(x^2+1)/x
________ / 2 \/ x + 1 ----------- x
/ ________\ | / 2 | d |\/ x + 1 | --|-----------| dx\ x /
Apply the quotient rule, which is:
and .
To find :
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Differentiate term by term:
The derivative of the constant is zero.
Apply the power rule: goes to
The result is:
The result of the chain rule is:
To find :
Apply the power rule: goes to
Now plug in to the quotient rule:
Now simplify:
The answer is:
________ / 2 1 \/ x + 1 ----------- - ----------- ________ 2 / 2 x \/ x + 1
2 x -1 + ------ ________ 2 / 2 2 1 + x 2*\/ 1 + x - ----------- - ----------- + ------------- ________ ________ 2 / 2 / 2 x \/ 1 + x \/ 1 + x ------------------------------------------- x
/ 2 2 \ | x x | |-1 + ------ ________ -1 + ------ | | 2 / 2 2 | | 1 + x 2*\/ 1 + x 2 1 + x | 3*|----------- - ------------- + -------------- + --------------| | 3/2 4 ________ ________| |/ 2\ x 2 / 2 2 / 2 | \\1 + x / x *\/ 1 + x x *\/ 1 + x /