標題:

急! F5 Trigonometry Solve 唔識做 ?

發問:

請詳細步驟教我計以下三條. 圖片參考:http://imgcld.yimg.com/8/n/HA05788109/o/20130605004307.jpg

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最佳解答:

4. cos 4x = - 1 4x = arccos ( - 1) = 180, 540, 900, 1260 x = 180/4, 540/4, 900/4, 1260/4 = 45, 135, 225, 315, 5. sin^2 2x = - 1/2 sin 2x = sqrt ( - 1/2) which is unreal, so no root. 6. tan 2x = sqrt 3 2x = arctan ( sqrt 3) = 60, 240, 420, 600 x = 60/2, 240/2, 420/2, 600/2 = 30, 120, 210, 300.

其他解答:7638E7481407D16B
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