document.write( "Question 631631: Find all real numbers in the interval [0,2pi] that satisfy the equation. Round to the nearest hundredth.
\n" ); document.write( "cos x = -0.23 \n" ); document.write( "

Algebra.Com's Answer #398344 by lwsshak3(11628) $\"\"$ $\"About$

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Find all real numbers in the interval [0,2pi] that satisfy the equation. Round to the nearest hundredth.
\n" ); document.write( "cos x = -0.23
\n" ); document.write( "arccos(-0.23)=1.803( in quadrant II where cos<0)
\n" ); document.write( "reference angle=π-1.803=1.339
\n" ); document.write( "2nd angle=1.339+π=4.481 (in quadrant III where cos is also<0)
\n" ); document.write( "all real numbers in the interval [0,2pi]: 1.803 and 4.481 radians \n" ); document.write( "

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