Recent content by cmab

I really don't understand hypothesis testing. How do I recognize which one is Ho and Ha in a problem? Is there a particular trick to facilitate my lfie?

How do we find the parametric equations for the line of intersection of the given planes 7x-2y+3z = -2 and -3x+y+2z+5=0 :approve:

Thanks, it is appriciated.

How can i proove if this line is perpendicular to this one? Line x=-2-4y, y=3-2t, z=1+2t Plane 2x+y-z=5 I don't care that much about the answer, I want the procedure.

(e+f)^2 = e^2+2ef+f^2 Why is this not neccesary true for squares matrices for all size?

Thanks bud, i'll look at it later on. If i have any problem, i'll post.

At first, i putted the first number in the frist row as 1. so i get [1 1/3 1/3 1/3 0] than i eliminate the 5 to make it a 0. But its after that i got ****ed! mayday!

Linear stuff: I never get the awnser...! [3 1 1 1 0] [5 -1 1 -1 0] Where the variables are X1 X2 X3 X4. I always get somethignt that is far away from the answer. The answer should be x1= -s x2=-t-s x3=4s x4 = t Help please!

Ok, I have to integrate this [int a=0 b=3] 1 / sqrt[abs(x-2)] dx what should i do ? do the improper integral of 1/-(x-2) and 1/(x-2) ?

In my paper it says use disk method. :cry:

I don't get it :confused:

I don't know if I did good, cause I'm uncapable of integrating it. :cry:

[int a=0 b=1] pie(arcsiny)^2 dy disk method.

How do I find the indefinite integral of 1/[(e^x)+(e^-x)] ? Do I have to multiply by [(e^x)-(e^-x)]/[(e^x)-(e^-x)] to eliminate the denominator? !

Can anybody help me find the volume y=sinx, bounded by the y axis, and the line y=1. The axis of revolution is the line y=1. I tried so many times and I can't find the correct answer, in the sheet it says (pie^2)/2 - 2pie