1.

If cot alpha equals the integral solution of inequality 4x ^(2)-16x+15 le 0 and sin beta equals to the slope of the bisector of the first quadrant, then sin (alpha+ beta) sin (alpha - beta)is equal to:

Answer»

`-3/5`
`-4/5`
`(2)/(SQRT2)`
`3`

ANSWER :B


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