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document.write( "First we look at the inner part:
\r\n" );
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document.write( "That asks for the angle between
and
whose sine\r\n" );
document.write( "is
. \r\n" );
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document.write( "Since we know that
,\r\n" );
document.write( "we draw such an angle by placing a right triangle\r\n" );
document.write( "in the first quadrant whose angle at the origin is such that its\r\n" );
document.write( "opposite side is y=1 and its hypotenuse is r=7, like this:\r\n" );
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document.write( "
\r\n" );
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document.write( "The angle indicated by the red arc is the angle:
.\r\n" );
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document.write( "To find the tangent, we must calculate the adjacent side x,\r\n" );
document.write( "using the Pythagorean theorem:\r\n" );
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document.write( "

\r\n" );
document.write( "

\r\n" );
document.write( "

\r\n" );
document.write( "

\r\n" );
document.write( "

\r\n" );
document.write( "

\r\n" );
document.write( "

\r\n" );
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document.write( "So we now have all three sides of the right triangle:\r\n" );
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document.write( "
\r\n" );
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document.write( "The problem is \r\n" );
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document.write( "
\r\n" );
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document.write( "and since we know that
\r\n" );
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document.write( "



.\r\n" );
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document.write( "Edwin
\r
\n" );
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document.write( " \n" );
document.write( "