求函数y=7-4sinxcosx+4cos2x-4cos4x的最大值和最小值.
解:
,
∴,。
You must attend the meeting ____ at ten o’clock, as it is scheduled—not a minute early or late.
A.accurately
B.punctually
C.flexibly
D.approximately
良性与恶性肿瘤判定中,最有诊断意义的是()
A.生长方式
B.生长速度
C.肿瘤的异型性
D.对机体影响
E.癌巢