If x, y, z are natural numbers such that cotā1x+cotā1y=cotā1z then the number of ordered triplets (x,y,z) that satisfy the equation is ___
A
1
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B
2
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C
Infinite solutions
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Solution
The correct option is CInfinite solutions x =1 : y =1 is not a solution of the given equation Suppose (x,y)≠(1,1) Then 1x+1y1−1xy=1z⇒x(z−y)=−(1+yz)⇒=−(1+yz)z−y If y=n+1:z=n then x=n2+n+1 All such numbers are solutions