UPSC 2015 CDS II Math Paper

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Question : 39 of 100
 
Marks: +1, -0
If
tan(x+40)°‌tan(x+20)°‌tan(3x)°‌tan(70−x)°‌tan(50−x)°=1
then the value of x is equal to
[2015 CDS-II]
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