MCQ
यदि $\theta+\phi=90^{\circ}$, तो $\left|\begin{array}{cc}\cos \theta & \sin \theta \\ \sin \phi & \cos \phi\end{array}\right|=$
  • A
    1
  • B
    $0$
  • -1
  • D
    $\infty$

Answer

Correct option: C.
-1
(C)

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