![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 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](https://d10lpgp6xz60nq.cloudfront.net/web-thumb/642529574_web.png)
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
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