1.

Consiser the system of equations x cos^(3)y+3xcosysin^(2)y=14to(1) and xsin^(3)y+3xcos^(2)y=13to(2) The value of x is/are

Answer»

`+-5sqrt(5)`
`+-SQRT(5)`
`+-1/(sqrt(5))`
`+-1/(5sqrt(5))`

ANSWER :A


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