If `alpha` and `beta` satisfy `sinalpha cosbeta=-(1/2)`, then the greatest value of `2cosalphasinbeta` is

if alpha and beta satisfy sin alpha cos beta=-(1)/(2), then the greatest value of 2cos alpha sin beta is

If alpha and beta satisfy sinalpha cos beta=-1/2 , then the greatest value of 2cos alpha sin beta is ……….

If sinalpha=1/2 and cosbeta=1/2 , then the value of (alpha+beta) is

If sinalpha=1/2 and cosbeta=1/2 , then the value of (alpha+beta) is

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

If sinalpha-sinbeta=a and cosalpha+cosbeta=b then write the value of "cos"(alpha+beta) .

sinalpha=(1)/(2) cos beta=(1)/(2) then alpha+beta=

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