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how do i use pi functions in developer tab?

Solved by A. S. in 12 mins

Nee help in terms of design and look of graph

Solved by Z. U. in 29 mins

Hello I am trying to convert a written formula into Excel but not having much joy! Please see below, is there anything obvious that I am missing?
=(F$2/sq(F$3^2+10^4*pi^2*F$4^2))*sin(100*pi*A2-tan^-1(100*pi*F$4/F$3))
Your help would be greatly received :)

Solved by O. S. in 28 mins

Hi I need please to make the graph more visibele in terms of numbers. Not clear

Solved by T. J. in 12 mins

i cant calculate sin(20*pi*0) 0-80 i need some assistants

Solved by A. F. in 20 mins