In any `DeltaABC`, if `B=60^0`, then prove that `(c-a)^2 = b^2 -ca`

In DeltaABC , if b+c=3a , then prove that: cotB/2.cotC/2=2

In any DeltaABC , prov "If in a "DeltaABC, /_C=90^(@)," then prove that sin"(A-B)=((a^(2)-b^(2)))/((a^(2)+b^(2)))

In any DeltaABC, is 2 cos B=a/c, then the triangle is

In a o+ABC, if /_B=60^(@), prove that (a+b+c)(a-b+c)=3ca

In any DeltaABC , prove that (c^(2)-a^(2)+b^(2))tanA=(a^(2)-b^(2)+c^(2))tanB=(b^(2)-c^(2)+a^(2))tanC

In any DeltaABC , prove that a(bcosC-c cosB)=(b^(2)-c^(2))

In any DeltaABC , prove that ((b-c))/acosA/2=sin((B-C))/2

In any DeltaABC , with usual notaions, prove that b^(2)=c^(2)+a^(2)-2ac cos B.

In any DeltaABC , prove that ac cosB-bc cosA=(a^(2)-b^(2))