If `3sinbeta=sin(2alpha+beta)` then

If 3 sin beta=sin(2alpha+beta) , then tan (alpha+beta)-2 tan alpha is

If 3sin beta = sin(2alpha + beta) , then tan(alpha + beta)-2tan alpha is:

If sin beta = 1/5 sin(2alpha +beta) , show that tan(alpha +beta) = 3/2 tan alpha .

sin alpha=sinbeta, cos alpha=cos beta then

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

If cos alpha+cos beta=0=sin alpha+sinbeta, then cos2alpha+cos 2beta=

If the lines x(sinalpha+sinbeta)-ysin(alpha-beta)=3 and x(cosalpha+cosbeta)+ycos(alpha-beta)=5 are perpendicular then sin2alpha+sin2beta is equal to:

If the lines x(sinalpha+sinbeta)-ysin(alpha-beta)=3 and x(cosalpha+cosbeta)+ycos(alpha-beta)=5 are perpendicular then sin2alpha+sin2beta is equal to:

If cosalpha+cosbeta=0=sinalpha+sinbeta, then prove that cos2alpha+cos2beta=-2cos(alpha+beta) .