If $x = \sin {130^o}\,\cos {80^o},\,\,y = \sin \,{80^o}\,\cos \,{130^o},\,\,z = 1 + xy,$which one of the following is true
If $x = \sin {130^o}\,\cos {80^o},\,\,y = \sin \,{80^o}\,\cos \,{130^o},\,\,z = 1 + xy,$which one of the following is true
- A
$x > 0,\,\,y > 0,\,\,z > 0$
- B
$x > 0,\,\,y < 0,\,\,0 < z < 1$
- C
$x > 0,\,\,y < 0,\,\,z > 1$
- D
$x < 0,\,\,y < 0,\,0 < z < 1$
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