document.write( "Question 602114: the expression tan(-220) is equivalent to?
\n" ); document.write( "a) tan 50
\n" ); document.write( "b) -tan 50
\n" ); document.write( "c) -tan 40
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Algebra.Com's Answer #380126 by stanbon(75887)\"\" \"About 
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the expression tan(-220) is equivalent to?
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\n" ); document.write( "-220 = +140 is in Q2 where the tangent is negative
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\n" ); document.write( "The reference angle for -220 is 40 degrees
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\n" ); document.write( "t(-220) = -tan(40)
\n" ); document.write( "a) tan 50
\n" ); document.write( "b) -tan 50
\n" ); document.write( "c) -tan 40
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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