- #1
kevinnn
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Homework Statement
y=[itex]\frac{}{}tsint/1+t[/itex]
Homework Equations
The Attempt at a Solution
What I do (and arrive at the wrong solution) is the fallowing. Can you please tell me where i go wrong. *I am going to leave out the denominator as i go through the problem because it stays the same the whole time and will make the problem look messier.
First step: I used the quotient rule and product rule for derivatives for the first step. Quotent rule because the problem is a fraction and quotent rule because the top is a product. after taking the necessary derivatives I get,
y'=1+t[tcos(t)+sin(t)]-tsin(t)
y'=tcos(t)+sin(t)+t^2cos(t)+tsin(t)-tsin(t)
y'=tcos(t)+sin(t)+t^2cos(t)/(1+t)^2
That answer is incorrect. the correct answer is y'=(t^2+t)cos(t)+sin(t)/(1+t)^2
Help appreciated!