document.write( "Question 875295: Find the exact value of sin 2u, cos 2u, and tan 2u given that the terminal sideof angle u goes through the point (1,2)
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Algebra.Com's Answer #528167 by lwsshak3(11628) $\"\"$ $\"About$

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Find the exact value of sin 2u, cos 2u, and tan 2u given that the terminal sideof angle u goes through the point (1,2)
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\n" ); document.write( "you are working with a reference right triangle in quadrant I, in which:
\n" ); document.write( "sin u=2/√5
\n" ); document.write( "cos u=1/√5
\n" ); document.write( "tan u=sin/cos=2/1=2
\n" ); document.write( "..
\n" ); document.write( "sin 2u=2sinucosu=2*2/√5*1/√5=4/5
\n" ); document.write( "cos 2u=cos^2u-sin^2u=1/5-4/5=-3/5
\n" ); document.write( "tan 2u=sin 2u/cos 2u=-4/3 \n" ); document.write( "

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