document.write( "Question 1039442: Find all values of 't' in the interval [0, 2pi] that satisfy 2cos't'+1=0 \n" ); document.write( "
Algebra.Com's Answer #654170 by Boreal(15235)\"\" \"About 
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that is 2 cos t= -1
\n" ); document.write( "cos t= (-1/2)
\n" ); document.write( "That occurs in the 2nd and third quadrants.
\n" ); document.write( "That is at pi/3 and 2 pi/3
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