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Although we, in English, don't really use a different form when speaking formally, Germans distinguish between the formal and the informal depending on who they are speaking to. The first basic rule of th...

using the product rule

product rule is dy/dx=v.du/dx+u.dv/dx

let u = x^2 and v = cos(x)

du/dx=2x

dv/dx = -sin(x)

so dy/dx=2xcos(x)-x^2sin(x)

"Desde hace" is used when talking about an interval of time, a duration, i;e: "Estoy enferma desde hace une semana." ("I have been sick for a week").

"Desde"...

Whoops.

(1/2)x(5/8)=5/16

100/16=6.25

6.25 x 5 = 31.25