- #1
Albert1
- 1,221
- 0
$if \,\, (x+\sqrt {x^2+1})\times (y+\sqrt {y^2+4})=7$
$find: \,\, x\sqrt {y^2+4}+ y\sqrt {x^2+1}=?$
$find: \,\, x\sqrt {y^2+4}+ y\sqrt {x^2+1}=?$