[ x ] [ 0 ] [ (sin x - tan x) 2 + (1 - cos 2x) 4 + x 5 ] (7tan 7x + sin 6x + 2sin 5x) = [ x ] [ 0 ] [ (sin x - tan x) 2 + (2sin 2x) 4 + x 5 ] (7tan 7x + sin 6x + 2sin 5x) = [ (sin 0 - tan 0)2 + (2sin20)4 + 05 ] (7tan7x + sin6x + 2sin5x) = [ 0 + 0 + 0 ] (7tan7x + sin6x + 2sin5x) = 0
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