If in a triangle \( A B C, \cos A \cos B+\sin A \sin B \sin C=1 \), then the triangle is (A) iso...

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If in a triangle \( A B C, \cos A \cos B+\sin A \sin B \sin C=1 \), then the triangle is
(A) isosceles
(B) right angled
(C) equilateral
(D) None of these
\( \mathrm{P} \)
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