Starting from (-1) × 5, write various products showing some pattern to show `(-1) (-1)= 1`.

Starting from (-1)xx5 write various products showing some pattern to show (-1)xx(-1)=1

Show that m-1 is a factor of m^(21)-1

Starting from propene sythesize 1,1- dibromopropane.

Show that : lim_(x rarr1)(2x-1)=1

(i ) If the length of perpendicular from origin to the line ax+by+a+b=0 is p , then show that : p^(2)-1=(2ab)/(a^(2)+b^(2)) (ii) If the length of perpendicular from point (1,1) to the line ax-by+c=0 is unity then show that : (1)/(a)-(1)/(b)+(1)/(C )=(c )/(2ab)

Show that the line through (2, -5) and (-2, 5) is perpendicular to the line through (6, 3) and (1, 1)

1 : 1 : 1 :1 ratio shows

If (1)/(x -y) lt 1 , then show that x does not lie from y to y + 1

Show that the following points are collinear : A(-2,1), B(-5,-1),C(1,3)