document.write( "Question 814387: Use the Half-Angle formulas to determine the exact values of sinx, cosx, and tanx Given: $\"+%28-17+%28pi%29%29%2F2+\"$ \n" ); document.write( "

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Use the Half-Angle formulas to determine the exact values of sinx, cosx, and tanx. Given: -17π/2
\n" ); document.write( "sin(-17π)=sin(π)=0
\n" ); document.write( "cos(-17π)=cos(π)=-1
\n" ); document.write( "tan(-17π)=tan(π)=0
\n" ); document.write( "..
\n" ); document.write( "Identity: sin(x/2)=ą√((1-cos(x))/2)
\n" ); document.write( "sin(-17π/2)=-√((1-(-1))/2)=-√(2/2)=-√1=-1
\n" ); document.write( "..
\n" ); document.write( "Identity: cos(x/2)=ą√((1+cos(x))/2)
\n" ); document.write( "cos(-17π/2)=-√((1+(-1))/2)=-√(0/2)=0
\n" ); document.write( "..
\n" ); document.write( "Identity: tan(x/2)=(sin(x))/(1+cos(x))
\n" ); document.write( "tan(-17π/2)=-1/(1+(-1))=-1/0=undefined \n" ); document.write( "

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