Mathematics
Senior High
請問這題要怎麼訂正
60°×2+210°=sin 210°
=sin(180°-(-30°))=sin(-30°)
(同界角關係)
(180°-0關係)
↓
=-sin30°:
1
=
2
sih (180-0)
(-0關係)
= 6i40
隨堂練習
試求tan(-225°)的值.
-1
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