Ask Me Help Desk - Using defination, find tan(

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Using defination, find tan(_225).

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

You might want to use the compound angles formula?

$\tan (A+ B) = \frac{\tan A + \tan B}{1 - \tan A\tan B}$

Put A = 180, B = 45

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

$<br /> tan \theta = \frac {sin \theta} {cos \theta}<br />$

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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