document.write( "Question 1075800: Sin420°cos390 - cos(-300°)sin(-330°) \n" ); document.write( "

Algebra.Com's Answer #690445 by ikleyn(53765) $\"\"$ $\"About$

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document.write( "sin(420°)*cos(390°) - cos(-300°)*sin(-330°) = \r\n" );
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document.write( "     sin(420°)  = sin(60°);\r\n" );
document.write( "     cos(390°)  = cos(30°);\r\n" );
document.write( "     cos(-300°) = cos(60°);\r\n" );
document.write( "     sin(-330°) = sin(30°).\r\n" );
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document.write( "= sin(60°)*cos(30°) - cos(60°)*sin(30°) = sin(60°-30°) = sin(30°) = .\r\n" );
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