document.write( "Question 641426: Graph the expression sec2 x - sec2 x sin2 x on your calculator. Determine what constant or single function is equivalent to the given expression. \r
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Algebra.Com's Answer #403672 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "sec˛x - sec˛x·sin˛x\r\n" );
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document.write( "To put that in your calculator\r\n" );
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document.write( "(1/cos(x))˛-(1/cos(x))˛(sin(x))˛\r\n" );
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document.write( "To graph that on a TI-83 or 84, don't press GRAPH, \r\n" );
document.write( "but instead press ZOOM, then press 7\r\n" );
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document.write( "Factor out sec˛x\r\n" );
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document.write( "sec˛x(1 - sin˛x)\r\n" );
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document.write( "Use the identity: cos˛x + sin˛x = 1 and solve for cos˛x\r\n" );
document.write( "                          cos˛x = 1 - sin˛x\r\n" );
document.write( "So replace 1 - sin˛x by cos˛x\r\n" );
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document.write( "sec˛x(cos˛x)\r\n" );
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document.write( "Then replace sec˛x by \"1%2Fcos%5E2%28x%29\"\r\n" );
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document.write( "(cos˛x)·\"1%2Fcos%5E2%28x%29\" =\r\n" );
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document.write( "\"%28cos%5E2%28x%29%29%2F%28cos%5E2%28x%29%29\" =\r\n" );
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document.write( "           1 \r\n" );
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document.write( "The constant 1.  However, sec˛x - sec˛x·sin˛x is not defined\r\n" );
document.write( "as 1 or as any number at all when x = any odd multiple of 90°\r\n" );
document.write( "if you're using degrees or \"pi%2F2\" if you're using radians.                \r\n" );
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document.write( "Edwin
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