document.write( "Question 1202972: Hi,
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document.write( "Solve cosx-3sinx=3.
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document.write( "I get -1/2 and -1.
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document.write( "Am I correct?
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document.write( "Thank you. \n" );
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Algebra.Com's Answer #838196 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! Solve cosx-3sinx=3. \n" ); document.write( "----- \n" ); document.write( "cos(x)-3sin(x) = 3 \n" ); document.write( "cos(x) = 3sin(x) + 3 \n" ); document.write( "cos^2(x) = 9sin^2(x) + 18sin(x) + 9 \n" ); document.write( "1 - sin^2(x) = 9sin^2(x) + 18sin(x) + 9 \n" ); document.write( "10sin^2(x) + 18sin(x) + 8 = 0 \n" ); document.write( "5sin^2(x) + 9sin(x) + 4 = 0 \n" ); document.write( "(5sin + 4)*(sin + 1) = 0 \n" ); document.write( "sin(x) = -1 --> x = 3pi/2 + n*2pi, n = integer \n" ); document.write( "-------- \n" ); document.write( "sin(x) = -4/5 --> x =~ 5.356 + n*2pi, n = integer \n" ); document.write( "x in radians. \n" ); document.write( " \n" ); document.write( " |