document.write( "Question 930588: Find the exact value of the given functions.\r
\n" ); document.write( "\n" ); document.write( "Given tan α = -4/3, α in Quadrant II, and tan β = 24/7, β in Quadrant III, find:\r
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\n" ); document.write( "\n" ); document.write( "[b] cos(α + β)\r
\n" ); document.write( "\n" ); document.write( "[c] tan(α − β)
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Algebra.Com's Answer #565128 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
This is all covered in great detail on wikipedia - half angle formulas.
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