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If sinx+sinygeqcosacosxAA in R , then s...

If `sinx+sinygeqcosacosxAA in R ,` then `siny+cosa` is equal to ___

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`cos `lapha cos x -sin x le sin y AA x in R`
`:. sin y ge` greatest value of `(cos alpha cos x - sin x)`
`:. sin y ge sqrt(cos^(2) alpha +1)`
`:. sin y=1` and `cos alpha =0`
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  14. If sinx+sinygeqcosacosxAA in R , then siny+cosa is equal to

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