" 21.If "A+B=(pi)/(4)" ,show that "(cot A-1)(cot B-1)=2

If A + B = (pi)/(4) , show that (cot A - 1) (cot B - 1) = 2 and hence deduce that cot 22^((1^(0))/(2))=sqrt(2)+1.

If A+B=45^(circ) , prove that (cot A-1)(cot B-1) = 2

If A+B=(pi)/(4), prove that: (1+tan A)(1+tan B)=2(cot A-1)(cot B-1)=2

If A + B = 45^(@), " then " (cot A - 1) ( cot B - 1) is

If A+B=135^(@) " then " (1+ cot A ) (1+cot B)=

If A+B=225 show that (cot A)/(1+cot A)*(cot B)/(1+cot B)=(1)/(2)

If A + B = 225^(@),"show that",(cotA)/(1 + cot A).(cot B)/(1 + cot B) =1/2.

Show that cot(pi/4+x)cot(pi/4-x)=1

Show that cot(pi/4+x)cot(pi/4-x)=1

Show that cot(pi/4+x)cot(pi/4-x)=1