किसी त्रिभुज ABC के लिए , सिद्ध कीजिए कि -
`(a-b)/(c)=(cos ((A-B)/(2)))/(cos""(C )/(2))`

सिद्ध कीजिए कि 2tan^(-1)sqrt((b)/(a))=cos^(-1)((a-b)/(a+b))

In /_ABC,cos((B+C)/(2))

In any Delta ABC, prove that :(b+c)cos((B+C)/(2))=a cos((B-C)/(2))])

For any triangle ABC, prove that (b+c)cos(B+C)/(2)=a cos(B-C)/(2)

In a triangle ABC, prove that (a)cos(A+B)+cos C=0(b)tan((A+B)/(2))=cot((C)/(2))

In Delta ABC, show that (1-cos A+cos B+cos C)/(1-cos C+cos A+cos B)=tan((A)/(2))cot((C)/(2))

In a triangle Delta ABC , prove the following : 2 abc cos.(A)/(2) cos.(B)/(2) cos.(C )/(2) = (a+b+c)Delta

In a triangle Delta ABC , prove the following : 2 abc cos.(A)/(2) cos.(B)/(2) cos.(C )/(2) = (a+b+c)Delta

In a triangle ABC if (sin2A+sin2B+sin2C)/(cos A+cos B+cos C-1)=((lambda)/(2))cos((A)/(2))cos((B)/(2))cos((C)/(2)) then lambda equals

If A,B,C are the angles of a triangle ABC that cos((3A+2B+C)/(2))+cos((A-C)/(2))=