Question

I am not able to understand a simple step, can anyone help me?

Answer 1

step1
\[T.(\sqrt{dx ^{2}+dy ^{2}} -dx)\]

Answer 2

into step 2
\[T.dx(1-\left( \frac{ dy }{ dx } \right)^{2})-1\]

Answer 3

can anyone explain this in detail?

Answer 4

step1 into step2, understanding

Answer 5

@inkyvoyd

Answer 6

ok, wave energy

Answer 7

equation

Answer 8

ok

Answer 9

@Farcher

Answer 10

@ParthKohli

Answer 11

Oh... not an issue, the step itself is wrong! :D

Answer 12

I read the comments down below in the tutorial hahaha, the professor made a mistake...

Answer 13

https://www.youtube.com/watch?v=VztHqMhknvc&index=19&list=PLX2gX-ftPVXWa7_h_WNtnEu5EZZGF8kQD