In a `DeltaABC`, if `A=[4pi]/9` and `B=[2pi]/9` , then `a^2-b^2` is equal to

In a DeltaABC , a=2b and |A-B|=(pi)/(3) . Then /_C is

In a DeltaABC ,a =5 , b= 4 , and tanC/2=sqrt(7/9) , then c =

If DeltaABC " if" angleA = pi/2 " then" cos^(2)B + cos^(2) C equals

In DeltaABC,a=2band|A-B|=(pi)/(3) , then angleC is equal to

In DeltaABC, a=5,b=4,A=(pi/2)+B, thenC

If in DeltaABC,A=(pi)/(7),B=(2pi)/(7),C=(4pi)/(7) y then a^(2)+b^(2)+c^(2) must be

tan^6(pi/9)-33tan^4(pi/9)+27tan^2(pi/9) is equal to

If in A B C ,A=pi/7,B=(2pi)/7,C=(4pi)/7 then a^2+b^2+c^2 must be

If A=sin((2pi)/7)+sin((4pi)/7)+sin((8pi)/7) and B=cos((2pi)/7)+cos((4pi)/7)+cos((8pi)/7) then sqrt(A^2+B^2) is equal to