Please could someone run through deriving these 2 equations through algebraic expansion.
Thankyou in advance.
edit ... just figured out the second one..
the first one I still can't get my head around!
i'll run through what i'm doing ..
i should be getting 1/sqrt(2y) ... where am i going wrong?
The sqrt(2) is a constant so take the derivative of sqrt(x). 1/2(sqrt(x)). Multiply by the constant and arrive at sqrt(2)/2(sqrt(x)). Multiply that by sqrt(2)/sqrt(2) to get your answer.