If sin `theta ` and - cos `theta ` are the roots of the equation `ax^2-bx-c=0` where a, b and c the side of a triangle ABC , then cos B is equal to :- - Sarthaks eConnect

If sin `theta ` and - cos `theta ` are the roots of the equation `ax^2-bx-c=0` where a, b and c the side of a triangle ABC , then cos B is equal to :-
A. `1-(c )/(2a)`
B. `1-(c )/(a)`
C. `1+( c)/(2a)`
D. `1+ (c )/(3a)`

If sin `theta ` and - cos `theta ` are the roots of the equation `ax^2-bx-c=0` where a, b and c the side of a triangle ABC , then cos B is equal to :-

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