document.write( "Question 805506: I have tried this problem and cannot seem to figure it out! It is: (tan^2theta-16)(2costheta+1)=0. The directions are to solve and k can be any integer. \n" ); document.write( "
Algebra.Com's Answer #485298 by lwsshak3(11628)\"\" \"About 
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Solve:
\n" ); document.write( "For interval:[0,2π]
\n" ); document.write( "(tan^2theta-16)(2costheta+1)=0
\n" ); document.write( "..
\n" ); document.write( "tan^2(x)-16=0
\n" ); document.write( "tan^2(x)=16
\n" ); document.write( "tan(x)=±√16
\n" ); document.write( "tan(x)=±4
\n" ); document.write( "Using inverse tan key of calculator:
\n" ); document.write( "round to 2 decimal places
\n" ); document.write( "x=1.33,1.86,4.47,4.96
\n" ); document.write( "..
\n" ); document.write( "2cos(x)+1=0
\n" ); document.write( "cos(x)=-1/2
\n" ); document.write( "x=2π/3, 4π/3 \n" ); document.write( "
\n" );