February 2018

Differential Equation

Submitted by AthenaKyuwa on February 13, 2018 - 1:44pm

Please help. Been staring at it for a few hours now.

cosysin2xdx +(cos^2y - cos^2x)dy = 0

Rupert de los Reyes's picture

Steel design

Submitted by Rupert de los Reyes on February 16, 2018 - 12:19pm

Is there a limit of value of modular ratio? If there is, what is the limit?