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+clear
+//
+//
+//
+
+//Variable declaration
+d=3.04 //interplanar spacing(angstrom)
+lamda=0.79 //wavelength of X-rays(angstrom)
+n=3
+
+//Calculation
+sintheta=n*lamda/(2*d)
+theta=(5+(25/60))*%pi/180; //glancing angle(radian)
+thetad=asin(sintheta)*180/%pi //glancing angle(degrees)
+thetam=(theta-int(theta))*60 //glancing angle(minutes)
+thetas=60*(thetam-int(thetam)) //glancing angle(seconds)
+
+//Result
+printf("\n glancing angle is %0.0f degrees %0.3f minutes %0.3f seconds",thetad,thetam,thetas)
+printf("\n answer given in the book is wrong")