document.write( "Question 1182094: determine the exact and simplified value of cos^240°-2tan60°sec30°. include a picture of the two special triangles. \n" ); document.write( "
Algebra.Com's Answer #812052 by ikleyn(52932)\"\" \"About 
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\n" ); document.write( "determine the exact and simplified value of cos240°-2tan60°sec30°.
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document.write( "cos(240°) = -cos(60°) = \"-1%2F2\".\r\n" );
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document.write( "tan(60°) = \"sqrt%283%29\".\r\n" );
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document.write( "sec(30°) = \"1%2Fcos%2830%5Eo%29\" = \"1%2F%28%28sqrt%283%29%2F2%29%29\" = \"2%2Fsqrt%283%29\".\r\n" );
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document.write( "Therefore,  cos240°-2tan60°sec30° = \"-1%2F2\" - \"2%2A%28sqrt%283%29%29%2A%282%2Fsqrt%283%29%29\" = \"-1%2F2\" - 4 = - 4 \"1%2F2\" = - 4.5.    ANSWER\r\n" );
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