[中學] 三角函數幾個問題
求板上神人詳解!
小弟感激不盡!!!
1.設 sin阿法 = -3/5 , tan被打 = 1/3 ,且270度<阿法<360度, 180度<被打<270度
求sin(阿法+被打)=?
2.cos系打=1/3, 且sin系打<0 ,求cos2系打=?
3.設sin系打-cos系打=1/2 , 請問 sin2系打、cos2系打、tan2系打為何?
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