Let c be the Champernowne's constant,
or c=0.123456789101112131415161718192021....
Show, without calculator aid, that
sin(c) + cos(c) + tan(c) > 10c
(In reply to
re(3): solution by Charlie)
c is small enough that you can get away with the fact that tan(c)>sin(c)
to squeeze in
sin(c) + cos(c) + tan(c) > 2sin(c)+cos(c) > 10c
Next maybe use 1/81 = .012345679012345679...
so 10/81>c and 100/81 > 10c
Actually I'm note sure how to use this since the functions are all increasing but 10c is increasing fastest.

Posted by Jer
on 20141213 20:25:35 