cos(x+π/6)=-1/2,怎么求x、?

cos(x+π/6)=-1/2,怎么求x、?
cos(x+π/6)=-1/2,怎么求x、?

cos(x+π/6)=-1/2,怎么求x、?
cos(x+π/6)=-1/2
x+π/6=2π/3+2kπ或x+π/6=4π/3+2kπ
x=π/2+2kπ或x=7π/6+2kπ （k∈Z）

cos（2π/3）=-1/2
x=π/2
或者2kπ+2/3π 或 2kπ+4/3π（k是整数）
。。。你带入减一下