सिद्ध कीजिए कि
`(cosA+cosB)/(cos B-cosA)=cot((A+B)/(2))cot((A-B)/(2))`

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

In DeltaABC, show that (1-cosA+cosB+cosC)/(1-cosC+cosA+cosB)=tan(A/2) cot (C/2).

In DeltaABC, show that (1-cosA+cosB+cosC)/(1-cosC+cosA+cosB)=tan(A/2) cot (C/2).

Prove that : 2cosA cosB = cos (A + B) + cos (A-B) .

(a+b+c)(cosA+cosB+cosC)

In DeltaABC, c (a cosB-b cosA)=

If cosA=mcosB , then ............. A) cot ((A+B)/(2)) =(m+1)/(m-1) tan ((B-A)/(2)) B) tan ((A+B)/(2)) =(m+1)/(m-1) cot ((B-1)/(2)) C) cot ((A+B)/(2)) =(m+1)/(m-1) cot ((B-A)/(2)) D) None of these

If cot A=(b)/(a) ,then prove that : (asinA - b cosA)/(asin A+bcosA)=(a^(2)-b^(2))/(a^(2)+b^(2))

Prove that: ((cosA+cos B)/(sinA-sinB))^n+((sinA+sinB)/(cosA-cosB))^n={2cot^n((A-B)/2) ,if n is even, 0 if n is odd,

Prove that: ((cosA+cos B)/(sinA-sinB))^n+((sinA+sinB)/(cosA-cosB))^n={2cot^n((A-B)/2),ifni se v e n0,ifni sod d,