document.write( "Question 944548: Solve the equation 4 times cosine of theta plus 1 = 2 times cosine of theta fortheta greater than or equal to 0 but less than 2 pi.. \n" ); document.write( "
Algebra.Com's Answer #854624 by ikleyn(53937)\"\" \"About 
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\n" ); document.write( "Solve the equation 4 times cosine of theta plus 1 = 2 times cosine of theta
\n" ); document.write( "for theta greater than or equal to 0 but less than 2 pi.
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\n" ); document.write( "\n" ); document.write( "        The solution in the post by @lwsshar3 is incorrect.\r
\n" ); document.write( "\n" ); document.write( "        I came to bring a correct solution.\r
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\n" ); document.write( "\n" ); document.write( "4cos(x) + 1 = 2cos(x)
\n" ); document.write( "2cos(x) + 1 = 0
\n" ); document.write( "cos(x) = -1/2
\n" ); document.write( "x = 2π/3, 4π/3         <<<---===         ANSWER\r
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\n" ); document.write( "\n" ); document.write( "Solved correctly.\r
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