find the exact value of 390 degrees. can anyone help me figure out how to start this?thanks much
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Originally Posted by daydreembelievr find the exact value of cot 390 degrees. can anyone help me figure out how to start this?thanks much I assume the red stuff was missing ..... cot (390 degrees) = cot(30 degrees).
cot(390) = cot(30) = cos(30)/sin(30)
why is it equal to cot 30 degrees? sorry if it is obvious. Is it because 390 - 360 = 30 If so, it it -360 because 360 is a coterminal angle? thanks
Last edited by daydreembelievr; Nov 6th 2008 at 03:18 PM.
Originally Posted by daydreembelievr why is it equal to cot 30 degrees? sorry if it is obvious. Is it because 390 - 360 = 30 If so, it it -360 because 360 is a coterminal angle? thanks Try showing 390 degrees on a unit circle. What do you notice?
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