Quick calculus question.

[Kevin Weddle]

The derivative of the sin 2X is the cos 2X. Correct. I was looking into the RMS and found some interesting stuff. If you take the RMS value and square it you get the average of the equation squared.

 

[surajbarkale]

Dear Kevin,
RMS = Root Mean Square
It is the root of the average of the sum of squares (sounds kool ;D)
see http://mathworld.wolfram.com/Root-Mean-Square.html if u like equations.
& btw derivative of sin2x is 2cos2x

 

[Kevin Weddle]

I think you are wrong about that. If you take 90 degrees for example you get the derivative of sin90=cos90. Therefore the derivative of the sin 2x=cos 2x.

 

[surajbarkale]

What a wonderful proof
d/dx(sin2x) = d/dx(sin2x) * d/dx(2x)
= 2 * cos2x

remember the chain rule for derivative ??? http://www.math.hmc.edu/calculus/tutorials/chainrule/
http://people.hofstra.edu/faculty/Stefan_Waner/RealWorld/trig/trig3.html