A) real and distinct
B) real
C) imaginary
D) real and equal
Correct Answer: B
Solution :
\[{{\sin }^{2}}B=\sin A\cos A\]\[\Rightarrow \,\,\cos 2B=1-\sin 2A\ge 0\]and \[D=4({{\cot }^{2}}B-1)\,=4\,\cos 2B.\cos e{{c}^{2}}\ge 0\]\[\Rightarrow \] roots are real.You need to login to perform this action.
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