document.write( "Question 810806: Find the exact value of arctan(tan(5pi/7)) ...I don't get it! Is there a formula to use?? \n" ); document.write( "
Algebra.Com's Answer #488434 by Alan3354(69443)\"\" \"About 
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Find the exact value of arctan(tan(5pi/7))
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\n" ); document.write( "5pi/7 is the angle
\n" ); document.write( "The tangent of it is some number.
\n" ); document.write( "Then, arctan is the angle whose tangent is that number.
\n" ); document.write( "= 5pi/7
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