Answers

2016-02-02T02:06:32+05:30
  f(x) = 3cosx + 4sinx + 5 
f '(x) = -3sinx + 4cosx 
0 = -3sinx + 4cosx 
3sinx = 4cosx 
tanx = 4/3 
x = 0.927 + npi radians for all integers, n 
f ''(x) = -3cosx - 4sinx 
f ''(0.927) = -5 < 0 so a maximum occurs at x = 0.927 
f ''(0.927 + pi) = 5 > 0 so a minimum occurs at x = 4.069 
f(0.927 + pi) = f(4.069) = 0
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