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If tanalpha is equal to the integral sol...

If `tanalpha` is equal to the integral solution of the inequality `4x^2-16 x+15<0` and `cosbeta` is equal to the slope of the bisector of the first quadrant, then `sin(alpha+beta)sin(alpha-beta)` is equal to `3/5` (b) `3/5` (c) `2/(sqrt(5))` (d) `4/5`

A

`3/5`

B

`-3/5`

C

`4/5`

D

`-4/5`

Text Solution

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The correct Answer is:
C
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