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If (25)^(2)+a^(2)+50a cos theta =(31)^...

If `(25)^(2)+a^(2)+50a cos theta`
`=(31)^(2)+b^(2)+62 b cos theta=1` and `775 + ab + (31a+25b) cos theta=0`, then the value of `cosec^ (2) theta` is

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