if `cosalpha=11/61` and `sinbeta=4/5`, find the values of `sin^2((alpha-beta)/2)` and `cos^2((alpha+beta)/2)`

If cosalpha+cosbeta=2/3 and sinalpha+sinbeta=2/5 then find the vvalue of tan((alpha+beta)/2)

If sin alpha + sin beta =2 , then find the value of cos^(2)alpha+cos^(2)beta .

If sin alpha+sin beta=2 then find the value of cos^(2)alpha+cos^(2)beta

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

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

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

It is known that sinbeta=4/5 and 0 < beta < pi then the value of (sqrt3 sin(alpha+beta)-2/cos(pi/6) cos(alpha+beta))/(sin alpha) is

It is known that sinbeta=4/5 and 0 < beta < pi then the value of (sqrt3 sin(alpha+beta)-2/cos(pi/6) cos(alpha+beta))/(sin alpha) is

(cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2= ............... A) 4 cos ^(2) ((alpha - beta)/(2)) B) 4 sin ^(2) ((alpha - beta)/( 2)) C) 4 cos ^(2) ((alpha + beta)/(2)) D) 4 sin ^(2) ((alpha +beta)/(2))