Thursday
December 5, 2013

# Posts by erica

Total # Posts: 485

s.s
I just took this exam and the answer is, in fact, cotton yarn.

Calc
Solve: du/dt = (sin t) / (u^2 + 1) So far I got: arctan u = -ln |csc t + cot t| + C I'm not sure where to go from there. Thank you so much for the help!

Calc
How do you take the integral of dy/(y^2 + 4)?

Calculus
What is the limit as t→∞ of L(t)? L(t) = 34 - 32e^(-0.0719t) Thank you so much!

Calculus
Suppose that you follow the size of a population over time. When you plot the size of the population versus time on a semilog plot (i.e., the horizontal axis, representing time, is on a linear scale, whereas the vertical axis, representing the size of the population, is on a l...

Calc
Find the integral from -∞ to -1 of 1/(1+x²) dx. I started working the problem out, and so far I got the lim as z→-∞ of [arctan (-1) - arctan (z)]. I'm a little bit confused exactly what is means when you plug -∞ into z, and how to solve the pro...

Calculus
How do you solve the integral from 0 to 1 of x arctan x dx?

Calculus
How do you integrate 3∫(1)/(x²+1)² dx ? Thank you!

Calc
Use substitution to evaluate the indefinite integral: The integral of [ (sq. root (1 + ln x)) ((ln x)/x) dx] Im confused on what i should substitute u and du for. Thank you so much!!

Calculus
Evaluate the indefinite integral: ∫ from 1 to 2 of ln (x²e^x) dx Thank you for your help!!

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