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+//Body is projected
+//u be the velocity of projection and alpha the angle of projection
+//then maximum height reached=((u^2)*(sind(alpha))^2)/(2*g)
+//range=((u^2)*sind(2*alpha))/(g)
+//in this case
+//Range=3*maximum height reached
+//thus
+alpha=atand(4/3) //degree
+printf("\n alpha=%.2f degree",alpha)