题目内容
(请给出正确答案)
[单选题]
下列式子不正确的是()
A.sin(x+π) =sinx
B.os(x+π) =-cosx
C.tan(x+π) =tanx
D.sin(x+π) =-sinx
答案
A、sin(x+π) =sinx
如果结果不匹配,请 联系老师 获取答案
A.sin(x+π) =sinx
B.os(x+π) =-cosx
C.tan(x+π) =tanx
D.sin(x+π) =-sinx
A、sin(x+π) =sinx
A.[x-(2y+1)]²
B.[x+(2y-1)][x-(2y-1)]
C.[(x+2y)-1][(x-2y)+1]
D.[x+(2y+1)]²