1.

If "Cos"^(-1)x/a+"Cos"^(-1)y/b=(5pi)/12 and "Sin"^(-1)x/a-"Sin"^(-1)y/b=(pi)/12 then (x^(2))/(a^(2))+(y^(2))/(b^(2))=

Answer»

`1`
`1/4`
`3/4`
`5/4`

ANSWER :D


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