" 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 prove that tan((alpha-beta)/(2))=+-sqrt((4-a^(2)-b^(2))/(a^(2)+b^(2)))

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

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

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

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

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

sin alpha + sin beta = a "and" cos alpha + cos beta = b (tan alpha + tan beta)/(1-tan alpha tan beta)=

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

If : 1+sin alpha * sin beta-cos alpha* cos beta=0" ""then" : tan alpha*cot beta=

If sin alpha-sin beta=a and cos alpha+cos beta=b then write the value of cos(alpha+beta)