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If alpha+beta=c\ w h e r e\ alpha,beta>0...

If `alpha+beta=c\ w h e r e\ alpha,beta>0` each lying between `0\ a n d\ pi//2` and `c` is a constant, find the maximum or minimum value of `sinalpha+sinbeta` b. `sinalphasinbeta` c. `t a nalpha+t a nbeta`

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