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  1. 04-08-2015, 10:34 PM Top | #1
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    tan (x+30) tan (x-30)= 1 -2cos2x / 1+ 2cos2x


  2. 04-09-2015, 01:19 PM Top | #2
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  4. 04-09-2015, 06:38 PM Top | #3
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    3 3-4cos 2x 1 1- 2cos2x


  5. 04-09-2015, 07:15 PM Top | #4
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    [IMG][/IMG]


  6. 04-09-2015, 08:44 PM Top | #5
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    cos^2x=1/2(1+cos2x)

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  8. 04-09-2015, 10:42 PM Top | #6
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    10 11


  9. 04-09-2015, 11:57 PM Top | #7
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    "]]


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  11. 04-10-2015, 12:24 AM Top | #8
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    "]]


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  13. 04-10-2015, 12:05 PM Top | #9
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  15. 04-11-2015, 04:25 PM Top | #10
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    7 8


  16. 04-11-2015, 05:06 PM Top | #11
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  18. 04-11-2015, 09:14 PM Top | #12
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    [IMG][/IMG]


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