November 7th, 2017, 09:18 AM  #1 
Senior Member Joined: May 2014 From: Allentown PA USA Posts: 107 Thanks: 6 Math Focus: dynamical systen theory  A demonstration
Dear MyMathForum Community: Let f(x) = sin(x). Show that (f(x+h)  f(x))/h = sin(x)((cos(h)  1))/h + cos(x)(sin(h)/h). Thank you. 
November 7th, 2017, 09:27 AM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,344 Thanks: 2466 Math Focus: Mainly analysis and algebra 
Use the obvious trigonometric identity.


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