If `sin alpha + sin beta=a` and `cos alpha+cosbeta=b` then `tan((alpha-beta)/2)` is equal to

If sin alpha+sin beta=a and cos alpha-cos beta=b then tan((alpha-beta)/2) is equal to-

If sin alpha+sin beta=a\ a n d\ cosalpha-cosbeta=b , then tan(alpha-beta)/2= -a/b b. b/a c. sqrt(a^2+b^2) d. none of these

If sin alpha + sin beta = a and cos alpha + cos beta = b, prove that : cos (alpha-beta) = 1/2 (a^2 + b^2 -2)

If cos(alpha+beta)=0 then sin(alpha+2beta)=

If sin alpha+sin beta=a\ a n d\ cosalpha+cosbeta=b , show that : sin(alpha+beta)=(2"a b")/(a^2+b^2)

sin alpha+ sinbeta=(1)/(4) and cos alpha+cos beta=(1)/(3) The value of tan (alpha+beta) is

If cot (alpha + beta) = 0 , then sin (alpha + 2 beta) is equal to

If sin alpha sin beta - cos alpha cos beta + 1=0, then the value of 1+cot alpha tan beta is

If sin alpha+sin beta=a\ a n d\ cosalpha+cosbeta=b , show that : cos(alpha+beta)=(b^2-a^2)/(b^2+a^2)

sin alpha+sin beta=(1)/(4) and cos alpha+cos beta=(1)/(3) The value of cos(alpha+beta) is