若a属于(0,π/4)试比较tan(a),tan(tan(a)),tan(sin(a))大小,

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若a属于(0,π/4)试比较tan(a),tan(tan(a)),tan(sin(a))大小,

若a属于(0,π/4)试比较tan(a),tan(tan(a)),tan(sin(a))大小,
若a属于(0,π/4)试比较tan(a),tan(tan(a)),tan(sin(a))大小,

若a属于(0,π/4)试比较tan(a),tan(tan(a)),tan(sin(a))大小,
a属于(0,π/4),∴0∴tan(sina)

tan(a)>tan(tan(a))>tan(sin(a))