Plotting 4sin2xsinx +2 -2cos(4x) + 1/2 - 1/2cos(2x)

[andrey21]

I have found a magnitude to be the following:

4sin^(2) 2x + 4sin2xsinx + sin^(2)x


I now need to plot this using excel so I have rewritten it as:

4sin2xsinx + 2 -2cos(4x) + 1/2 - 1/2cos(2x)

4sin2xsinx +5/2 - 2cos(4x) -1/2cos(2x)

Using the fact:

sin^(2)x = 1/2 - 1/2cos(2x)

Is this correct?

 

[vela]

What you did looks fine, but how does it help? Why not just plug the original formula into Excel to plot it?

 

[andrey21]

I was just a little unsure how to enter sin^2... in Excel. But aslong as other way looks fine i don't mind using that formula. Thanks Vela