Homework Statement
Man with mass M pulling with constant horizontal force F along a rope attached to object with mass m. Both the man and the object are on a frictionless surface and separated by distance D. When the man and object meet, what is the velocity of the object? Velocity of the man...
I know how to change sinx to sin 2t/sqrt(1+4t^2)
but I'm not sure how to simplify cos^2 (x/2) since it has the 1/2 in front of the x and I can't use the same trick that I used for sinx.
Okay so, given:
integral dx/(2+sinx)
tan(x/2) = t
(1/2)sec^2 (x/2) dx = dt
dx = 2cos^2 (x/2) dt
integral
2cos^2 (x/2) dt / (2+sinx)
Am I supposed to use x = arctan(2t)? If so, is it possible to simplify by drawing a triangle?
Homework Statement
Integral of 1/(2+sin(x)) dx
Homework Equations
The Attempt at a Solution
I've been told that you can use trig subs, but I never had to learn that in high school and it hasn't appeared in any of my calculus coursework.
As a side note. I've been wondering if it...
I tried multiplying it out and got
1 = y^3 (A+B+C) + y^2 (B-C+D) + y(B-D) - A
Even knowing that A = -1 and B = 1/3, I'm still not seeing the "nice" solution.
Oh and, my original problem involved using y, but I wanted to use Mathmatica which solves dx integrals and I copied and pasted...
So I set
1/[y(y-1)(y^2+y+1)] = A/y + B/(y-1) + (Cy+D)/(y^2+y+1)
1 = (y-1)(y^2+y+1)A + y(y^2+y+1)B + y(y-1)(Cy+D)
y = 0, A = -1
y = 1, B = 1/3
Not sure what to do for C and D
Homework Statement
[1/(x^4 - x)]dx
Homework Equations
The Attempt at a Solution
I factored the denominator to x(x-1)(x^2 + x +1) and I'm not sure if I can use partial fractions.