document.write( "Question 952106: if tanθ = 4 and 180° < θ < 270° determine the exact value of cosθ \n" ); document.write( "

Algebra.Com's Answer #581459 by Alan3354(69443) $\"\"$ $\"About$

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if tanθ = 4 and 180° < θ < 270° determine the exact value of cosθ
\n" ); document.write( "--------------------
\n" ); document.write( "tan = y/x = 4/1
\n" ); document.write( " $\"r+=+sqrt%28x%5E2+%2B+y%5E2%29+=+sqrt%2817%29\"$
\n" ); document.write( "|cos| = x/r = $\"sqrt%2817%29%2F17\"$
\n" ); document.write( "cosine is negative in Q3
\n" ); document.write( "--> $\"-sqrt%2817%29%2F17\"$ \n" ); document.write( "

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