Mathematics
SMA
ๆฑ่งฃ๐๐๐ ่ฌ่ฌ
ๅใ่จ็ฎ้ก(1 ้ก,ๆฏ้ก 20 ๅ,ๅ
ฑ20 ๅ)
1. ่ฅx็ๆน็จๅผ 2cost-sinx +1=0ๆ่งฃๆ,ๆฑๅธธๆธ็็ฏๅ
T
11
2 8 Ets
11
150 < p < 180
3
O
4. (2 sin 0 - 1)(72 cos 0 +1) > 0 ยท 0ยฐ <O< 360ยฐ, JIJ O m (30 <B<B5
and
sino = 1 / 2 = 0 - 2
> // | Sing =30
DD
sino
A
150ยฐ 225
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