dylan-white_60a36afe85a28
dylan-white_60a36afe85a28
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tg (2.a) = 2.tga /1-tg²a.............=> a=(3x) => tg(3x)=4 tg (2.3x) = 2.tg(3x) /1 -[tg(3x)]² tg (6x) = 2.4 /1 -[4]² = 8/1-16 = 8/-15 = -8/15