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In 2009, the national college entrance examination of science and mathematics volume 1, 16.
y=tan(2x)(tanx)^3=2(tanx)^4\[ 1-(tanx)^2]=2\r

R =1\ (tanx) 4-1\ (tanx) 2, you can use a quadratic function to find the extreme value.

......... 1\(tanx)^2 < 1

...................................... is very difficult to play, and the answer is 8.

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