Trigonometric EquationHard
Question
If tan 
and tan 
are the roots of the equation 8x2 - 26x + 15 = 0 then cos (α + β) is equal to-
and tan are the roots of the equation 8x2 - 26x + 15 = 0 then cos (α + β) is equal to-Options
A.-
B.
C.
D.-1
Solution
tan
tan 
tan
tan 
tan
=
cos (α + β) =
=
tan tan
tan tan
=cos (α + β) =
=
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