Recent content by faisal-tesla

a problem in minima and maxima applicatios (urgent !)please Homework Statement A straight river 3km wide runs due east. A cable is to be laid from a point A on the south bank of the river to a point B on its north bank, 9km downstream from A. The cable is to be laid in a straight line from...

I used both identities; it worked finally thank you for your help . appreciated it.

yes i did, but i used the identity tan 2x = 2tanx/ (1-tan^2(x) ) after that, it got messy when i plugged in (x+h)

Homework Statement Can someone please derive tan(2x) using the definition of the derivative? Homework Equations The Attempt at a Solution I've tried to expand it but I couldn't get anywhere with it thank you,