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    varya's Avatar
    varya Posts: 1, Reputation: 1
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    #1

    Mar 12, 2011, 01:15 AM
    Using defination, find tan(_225).
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 12, 2011, 02:29 AM

    I'm not sure I understand what you mean by 'defination'...

    You might want to use the compound angles formula?



    Put A = 180, B = 45
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Mar 14, 2011, 07:01 AM

    I think what the OP meant is to use the definition:



    Finding the sine and cosine of 225 degrees is pretty straight forward - just remember that it's 45 degrees "past" 180, which puts it in the 3rd quadrant. Varya - can you take it from here?
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