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F.4 basic trigonometry

發問:

1)Simplify http://img690.imageshack.us/img690/8643/dsc00586n.jpg 2)Simplify http://img13.imageshack.us/img13/5766/dsc00585wk.jpg please show clear steps.thank you!

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圖片參考:http://h.imagehost.org/0531/ScreenHunter_04_Jun_03_18_46.gif http://h.imagehost.org/0531/ScreenHunter_04_Jun_03_18_46.gif

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