【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.