[" 28.If "sin alpha+sin beta=a" and "cos alpha+cos beta=b" ,"],[" (i) "sin(alpha+beta)=(2ab)/(a^(2)+b^(2))]

If sin alpha+sin beta=a and cos alpha-cos beta=b then

If sin alpha+sin beta=a and cos alpha+cos beta=b show that sin(alpha+beta)=(2ab)/(alpha^(2)+beta^(2))

sin alpha + sin beta = a "and" cos alpha + cos beta = b sin (alpha + beta) =

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 s in alpha+s in beta=a and cos alpha+cos beta=b show that: sin(alpha+beta)=(2ab)/(a^(2)+b^(2))cos(alpha+beta)=(b^(2)-a^(2))/(b^(2)+a^(2))

If sin alpha + sin beta = a , cos alpha + cos beta = b " then sin ( alpha + beta ) =

sin alpha + sin beta = a, cos alpha + cos beta = b rArr sin (alpha + beta)

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

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