Question

Doris

求解🙏🙏🙏

sie Oʻ<O<360, at 2 Sino-57 cose +1 -0 , fu cose =
a
o
a

Answer 1

✨ 最佳解答 ✨

我就是我

2sin²-√3cos+1
=2(1-cos²)-√3cos+1
=-2cos²-√3cos+3
十字交乘
=(-2cos+√3)(cos+√3)
cos=√3/2或-√3(不合)