If in a `triangle ABC` with usual notation, `a(a-c)=b^(2)-c^(2)` ,then `1572(sin^(2)(pi cos^(2)B))` is equal to

If in triangle ABC , with usual notations , a=18,b=24,c=30 , then sin.(A)/(2) is equal to

If any triangle ABC with usual notations prove c=a cos B + b cos A .

In a triangle ABC with usual notation,if a+b=3c, then tan((A)/(2))tan((B)/(2)) is equal to

In Delta ABC with usual notation, (c-b cos A)/(a) is equal to

In DeltaABC with usual notation, (c-b cos A)/(a) is equal to

In triangle ABC , with the usual notations , prove that 2{a sin^(2).(C)/(2)+csin^2.(A)/(2)}=a+c-b

In a triangle ABC (with usual notations), (sin A+sin B)sin C=(a.b)/(2R^(2)) ,then which of the following are always true-

In Delta ABC , with usual notations prove that : b^(2) = c^(2) +a^(2) - 2 ca cos B .

In a triangle ABC, with usual notations, if |[1,a,b] , [1,c,a] , [1,b,c]|=0 then 4sin^2A+24sin^2B+36sin^2C=

In a Delta ABC with usual notations, if (a)/(cos A)=(b)/(cos B)=(c )/(cos C) , then the triangle is :