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  1. 12-04-2015, 02:13 AM Top | #73
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  3. 12-04-2015, 07:28 AM Top | #74
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  5. 12-04-2015, 09:38 AM Top | #75
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    x does not equal 3pi/2 and a+x/2 does not equal k pi




    tan a=1


    then a= pi/4 +k pi

    ; 12-04-2015 09:43 AM

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  7. 12-04-2015, 09:49 AM Top | #76
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    ; 12-04-2015 10:13 AM



  8. 12-04-2015, 10:03 AM Top | #77
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    cot (x+y) which is not true when x=y=pi/6


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  10. 12-04-2015, 10:13 AM Top | #78
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  12. 12-04-2015, 12:48 PM Top | #79
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    a

    cot is periodic and its period= pi


    so a=pi/4 +k pi

  13. 12-04-2015, 04:34 PM Top | #80
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  15. 12-04-2015, 07:57 PM Top | #81
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    ; 12-06-2015 09:55 PM



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  17. 12-06-2015, 12:31 AM Top | #82
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  18. 12-06-2015, 09:57 PM Top | #83
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    cot cos



  19. 12-06-2015, 11:13 PM Top | #84
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