MCQ
$\cot x\cot 2x-\cot 2x\cot 3x-\cot 3x\cot x=..........$
- ✓$1$
- B$2$
- C$-1$
- D$-2$
$\cot 3x=\cot(2x+x)$
$\frac{\cot 3x}{1}=\frac{\cot 2x\cot x-1}{\cot 2x+\cot x}$(સૂત્રનો ઉપયોગ કરતા)
$\Rightarrow \cot 3x\cot 2x+\cot 3x\cot x=\cot 2x\cot x-1$
$\Rightarrow \cot x\cot 2x-\cot 2x\cot 3x-\cot 3x\cot x=1$
તેથી માંગેલ જવાબ $1$ મળે.
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