document.write( "Question 920124: Find the exact value of the trigonometric function at the given real number.\r
\n" ); document.write( "\n" ); document.write( "(a) cos(− π/3) = \r
\n" ); document.write( "\n" ); document.write( "(b) sec(− π/3) = \r
\n" ); document.write( "\n" ); document.write( "(c) tan(−π/3) = \r
\n" ); document.write( "\n" ); document.write( "Please explain
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Algebra.Com's Answer #558170 by ewatrrr(24785)\"\" \"About 
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(a) cos(− π/3) = cos(π/3) = 1/2
\n" ); document.write( " (b) sec(− π/3) = 1/cos(π/3) = 2/1
\n" ); document.write( " (c) tan(−π/3) = - tan(π/3) = -√3
\n" ); document.write( "Note: tanx = sinx/cosx
\n" ); document.write( ".....See below (cosx, sinx) Summary Unit Circle
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