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一、选择题 :( 1)～ ( 12 ) . DBDAB CA DBB DC.二、填空题 :( 13) - 2 . ( 14 ) 6 . ( 15) y - 4x + 4=0 . ( 16 ) 4 .三、解答题( 17)本小题主要考查三角函数的基本性质和恒等变换的基本技能 ,考查运算能力 .解 :y =sin4 x + 2 3sinxcosx - cos4 x =( sin2 x + cos2 x)
First, the multiple-choice questions: (1) ~ (12). DBDAB CA DBB DC. Second, fill in the blank: (13) - 2 . (14) 6 . (15) y - 4x + 4 = 0 (16) 4. Third, answer questions (17) This topic mainly examines the basic properties of the trigonometric functions and the basic skills of the equivalence transformation, and examines the computing power. Solution: y = sin4 x + 2 3sinxcosx - cos4 x = (sin2 x + cos2 x)