【简答题】已知向量, a =(m,1), b =(sinx,cosx),f(x)= a ? b 且满足f( π 2 )=1. (1)求函数y=f(x)的解析式;并求函数y=f(x)的最小正周期和最值及其对应的x值; (2)锐角△ABC中,若f( π 12 )= 2 sinA,且AB=2,AC=3,求BC的长.
【单选题】Most of what I know about carpentry, which is almost nothing, I learned in Shop.You should know that I took Shop during the Eisenhower administration, when boys took Shop and girls took Home Economics...
A.
inform readers about the nature of shop classes.
B.
argue that shop classes should be eliminated from public schools.
C.
amuse readers with humorous details about shop classes.
【简答题】A.The following expressions are commonly used in English when you accept or decline an invitation. Put them into Chinese. Mr. and Mrs. Zhang accept with pleasure Mr. and Mrs. Adams’ invitation to dinn...
【简答题】阅读理解。 People who travel long distances will have to decide whether they would prefer to go by land, sea or air.Maybe nobody would say they enjoy sitting in a train for more than a few hours. The train...