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diff --git a/104/CH9/EX9.6/9_6.jpeg b/104/CH9/EX9.6/9_6.jpeg
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+++ b/104/CH9/EX9.6/9_6.jpeg
diff --git a/104/CH9/EX9.6/9_6.sce b/104/CH9/EX9.6/9_6.sce
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+//stability of non minimum phase loop transfer_function
+s=%s;
+sys=syslin('c',10*(s+2)/(s^3+3*s^2+10))
+nyquist(sys)
+show_margins(sys,'nyquist')
+printf("Z=0 hence sys is closed loop stable but as it is a non minimum phase loop_function it should satisfy angle criterion")
+Z=0//no of zeroes of 1+G(s)H(s) in RHP
+P=2//no of poles in RHP
+Pw=0//no of poles on jw axis including origin
+theta=(Z-P-0.5*Pw)*180
+disp(theta,"theta for stability=")
+printf("theta from nyquist_plot = -360 \n hence system is stabe")
+\ No newline at end of file