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(2): solution by Ady TZIDON)
Yes the only problem is that to get that .008 you needed to use a calculator.
An alternative would be to use two more terms of the Taylor series, perhaps with an easier to use number than Champernowne's: at x=1/8, the sum already exceed's 10 x Champernowne's number and is increasing; if that could be shown easily (p&p) with more Taylor terms, that would be good.

Posted by Charlie
on 20141213 13:17:10 