, 29 2006 . 10:53
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1) 2sinx-4cosx-tgx=ctgx-2cosxctgx-2
, ...
2) sin^2x+4cos^2x-2sin2x+sinx-2cosx=2
, , ...
3) 1/(tg5x+tg2x)-1/(ctg5x+ctg2x)=tg3x
Don't be so sad, you not be one, and anything is possible, if you are strong...
4) 5sin^2x-cos^2x=4sinxcosx
, , , , ...
5) tg(0,5cosx)=ctg(0,5sinx)
, , ...