document.write( "Question 968978: if sine theta = -4/7 and is in quadrant 3, then the sum of sine theta + sine (theta-pie)+sine(2pie+theta) is? \n" ); document.write( "
Algebra.Com's Answer #592033 by lwsshak3(11628)\"\" \"About 
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if sine theta = -4/7 and is in quadrant 3, then the sum of sine theta + sine (theta-pie)+sine(2pie+theta) is?
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\n" ); document.write( "sinx=-4/7 (Q3)
\n" ); document.write( "cosx=-√(1-(sin^2(x)=-√(1-16/49)=-√(33/49)=-√33/7
\n" ); document.write( "sinx+sin(x-π)+sin(2π+x)
\n" ); document.write( "sinx+(sinxcosπ-cosxsinπ)+(sin2πcosx+cos2πsinx)
\n" ); document.write( "=-4/7+(-4/7*-1-(-√33/7)*0)+(0*-√33/7+1*-4/7)
\n" ); document.write( "=-4/7+(4/7)-4/7
\n" ); document.write( "=-4/7 \n" ); document.write( "
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