`(sinalpha+ sinbeta)/(sinalpha-sinbeta)=(tan((alpha+beta)/2))/( tan((alpha-beta)/2)`

(sinalpha+sinbeta-sin(alpha+beta))/(sinalpha+sinbeta+sin(alpha+beta))=tan(alpha/2)tan(beta/2)

sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta)

If alpha,beta in (-pi/2,0) such that (sin alpha+sinbeta)+(sinalpha)/(sinbeta)=0 and (sinalpha+sinbeta) (sinalpha)/(sinbeta)=-1 and lambda=lim_(n->oo) (1+(2sinalpha)^(2n))/((2sinbeta)^(2n)) then :

Show that: sin^2 alpha + sin^2 beta + 2sinalpha sinbeta cos(alpha+beta)=sin^2 (alpha+beta)

Show that: sin^2 alpha + sin^2 beta + 2sinalpha sinbeta cos(alpha+beta)=sin^2 (alpha+beta)

If 3 sinalpha=5sin beta , then find the value of ("tan"(alpha+beta)/2)/("tan"(alpha-beta)/2)

If sinalpha+sinbeta=a ,cosalpha+cosbeta=b=>sin(alpha+beta) =

Prove that: sinalpha+sinbeta+singamma-sin(alpha+beta+gamma)=4sin((alpha+beta)/2)sin((beta+gamma)/2)sin((gamma+alpha)/2)dot

If (sinalpha)/(sinbeta)=(cosgamma)/(cosdelta), then (sin((alpha-beta)/2)*cos((alpha+beta)/2)*cosdelta)/(sin((delta-gamma)/2)*sin((delta+gamma)/2)*sinbeta) is equal to

If (sinalpha)/(sinbeta)=(cosgamma)/(cosdelta), then (sin((alpha-beta)/2)*cos((alpha+beta)/2)*cosdelta)/(sin((delta-gamma)/2)*sin((delta+gamma)/2)*sinbeta) is equal to