Recent content by yaho8888

when solving abs equations, first find the zeros and find out which part is negative, then do the integral for the individual part, when you get negative just take the abs value then add all the parts in the interval up.

Homework Statement Find the gerneral solution of the differential equation below: dy/dt=(-y/t)+2 Homework Equations none The Attempt at a Solution my solution by using integrating factor: 1.find the homogenous solution first dy/y = -1/t dt you get ln(y) = -ln(t) when...

ye! sorry. 8-p^2*sin^2(phi) but if I use = \rho^2 sin^2(\phi) are the limit of this integral right for the question stated above.

Homework Statement Evaluate the integral below, where H is the solid hemisphere x^2 + y^2 + z^2 ≤ 9, z ≤ 0 \iiint 8-x^2-y^2\,dx\,dy\,dz. Homework Equations none The Attempt at a Solution \int_{0}^{2\pi} \int_{\frac{\pi}{2}}^{\pi} \int_{0}^{3} (8-2p^2 \sin^2{\phi}) p^2...

What is the coeffcient of x^2*y^3*z in the polynomial(2x-y^2+3z)^6? please give me an example, and how do i deal with coeffienct that is inside the function 2, -1, and 3.

solved!

fx is the derivative of the function respect to x fy ........... y Where is sine 0? at zero sin is zero

Homework Statement find local max min and saddle point. f(x,y)= sin(x)sin(y), -pi<x<pi, -pi<y<piHomework Equations noneThe Attempt at a Solution fx = cos(x)sin(y) fy= sin(x)cos(y) now how do I get the critical points, I know how to get max min and saddle point, but I don't know how to get...

thanks for the help. I got it! (one more thing, I am a grasshopper!) :)

how come no one is helping?

Homework Statement lim (x^2+y^2)/((root(x^2+y^2+1) - 1) (x,y)-->(0,0) what is the limit Homework Equations none The Attempt at a Solution \lim_{(x,y) \to (0,0)} \frac {x^2 + y^2}{\sqrt{x^2 + y^2 + 1} - 1} = \lim_{r \to 0} \frac {r^2}{\sqrt{r^2 + 1} - 1} I got this far the...

Homework Statement A skier starts from rest at the top of a 26 degree slope 1.3Km long. how long does it take to reach the bottom? (no friction) The attempt at a solution m=mass m*g*sin(24) = ma(at slope direction) divide both side by m we got g*sin(24)=a then use...

can u gave me some examples of injective function that is not surjective. Is f(x)=y a injective function that is not surjective?

wouldn't that be 4*(9.8/1000)/(1/3600)^2

[SOLVED] I don't know if I did the problem right check please. Homework Statement A jet is diving vertically downward at 1200km/hr the pilot can withstand a maximum acceleration of 4G, before losing consciousness, at what height must the plane start a quarter turn to pull out of the dive...