SOLUTION: the expression tan(-220) is equivalent to? a) tan 50 b) -tan 50 c) -tan 40

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Question 602114: the expression tan(-220) is equivalent to?
a) tan 50
b) -tan 50
c) -tan 40
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
the expression tan(-220) is equivalent to?
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-220 = +140 is in Q2 where the tangent is negative
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The reference angle for -220 is 40 degrees
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t(-220) = -tan(40)
a) tan 50
b) -tan 50
c) -tan 40
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Cheers,
Stan H.