Melody

To post the pic just open the image tab and past the URL in.

It is super easy!

This is very easy to put into one cell.

I just separated it to make it easier to follow :)

Hi 

My Excel is the English version ..      

Oh that answer formula should be    B5/B7

You will have to wait a bit RedRyder, you haven't been here long enough yet ://

sin(t)cos(t)[sec(t)-csc(t)]=

\(sin(t)cos(t)[sec(t)-csc(t)]\\ =sin(t)cos(t)[\frac{1}{cos(t)}-\frac{1}{sin(t)}]\\ =\frac{sin(t)cos(t)}{cos(t)}-\frac{sin(t)cos(t)}{sin(t)}\\ =sin(t)-cos(t)\)

(log(x^2*\sqrt(b))/a=_*_+_*_-_

\(log\frac{(x^2*\sqrt{b})}{a}\\ =log x^2+log\sqrt{b}-loga\\ =log x^2+log(b)^{0.5}-loga\\ =2*log x+0.5*log(b)-loga\\ \)

A cone is a circluar pyramid and the volume of any pyramid is

volume = (1/3) *area of base * perpendicular height

\(volume =\frac{1}{3}*\pi r^2*h\)

 How do you prove the surface area of a sphere formula? Thanks!

Here is one proof:

graph csc(x +pi/3)

You cannot divide by 0.

It is undefined!