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Assertion (A): For alphaltbeta equation ...

Assertion (A): For `alphaltbeta` equation `(x-cosalpha)(x-cosbeta)-2=0` has one root less than `cosbeta` and other greater than `cosalpha`., Reason (R): Quadratic expression`ax^2+bx+c` has sign opposite to that of a between the roots `alpha and beta` of equation `ax^2+bx+c=0` if `alphaltbeta` (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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