1
TS EAMCET 2020 (Online) 10th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a triangle $A B C$, if $\cos A \cos B+\sin A \sin B \sin C=1$, then $a: b: c=$

A

$1: 1: \sqrt{2}$

B

$1: 1: 1$

C

$\sqrt{2}: 1: 1$

D

$1: \sqrt{2}: 1$

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