If `sinalpha=45/53 ,sinbeta=33/65` and `alpha,beta in (0,pi/2)` then

If sin alpha=(45)/(53),sin beta=(33)/(65) and alpha,beta in(0,(pi)/(2)) then

Let alpha, beta be such that pi lt=alpha lt=beta lt=3pi if sinalpha + sinbeta = -21/65 and cosalpha + cosbeta = -27/65 , then the value of cos""(alpha - beta)/65 is :

Let alpha and beta be such that pi < alpha-beta<3pi, If sinalpha+sinbeta=-(21)/(65) and cosalpha+cosbeta=-(27)/(65) , then the value of cos(alpha-beta)/2 is (a) -3/(sqrt(130)) (b) 3/(sqrt(130)) (c) 6/(25) (d) 6/(65)

Let alpha, beta be such that pi lt alpha-betalt3pi if sin alpha+sinbeta = -21/65 and cos alpha+cos beta = -27/65 , then the value of cos(alpha-beta)/(2) is

Let alphaandbeta be such that piltalpha-betalt3pi . If sinalpha+sinbeta=-(21)/(65)and cosalpha+cosbeta=-(27)/(65) , then the value of "cos"((alpha-beta))/(2) is

If sinalpha=1/sqrt5 and sinbeta=3/5 , then beta-alpha lies in

If sinalpha=1/sqrt5 and sinbeta=3/5 , then beta-alpha lies in

If sinalpha=1/sqrt5 and sinbeta=3/5 , then beta-alpha lies in

Let alpha,beta be such that piltalpha-betalt3pi . If sinalpha+sinbeta=-(21)/(65)andcosalpha+cosbeta=-(17)/(65) , then the value of cos.(alpha-beta)/(2) is :

Let alpha,beta be such that pi<(alpha-beta)<3pi . If sinalpha+sinbeta=-21/65 and cosalpha+cosbeta=-27/65 , then the value of cos((alpha-beta)/2) is