document.write( "Question 606095: 1.Interval 0 is less than or equal to x which is less than or equal to 2pie. Solution of cos squaredx = cos x \r
\n" ); document.write( "\n" ); document.write( "2. Exspress as a single fraction,the exact value of sin 75° \n" ); document.write( "
Algebra.Com's Answer #382039 by lwsshak3(11628)\"\" \"About 
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For 0 < x < 2π
\n" ); document.write( "cos^2x=cosx
\n" ); document.write( "cos^2x-cosx=0
\n" ); document.write( "cosx(cosx-1)=0
\n" ); document.write( "cosx=0
\n" ); document.write( "x=π/2 and 3π/2
\n" ); document.write( "..
\n" ); document.write( "cosx-1=0
\n" ); document.write( "cosx=1
\n" ); document.write( "x=0
\n" ); document.write( "ans:
\n" ); document.write( "x=0, π/2, and 3π/2\r
\n" ); document.write( "\n" ); document.write( "2. Express as a single fraction,the exact value of sin 75º
\n" ); document.write( "Using sin addition formula:
\n" ); document.write( "sin 75=sin(30+45)
\n" ); document.write( "=sin30cos45+cos30sin45
\n" ); document.write( "=1/2*√2/2+√3/2*√2/2
\n" ); document.write( "=√2/4+√6/4
\n" ); document.write( "=(√2+√6)/4
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