CBSE Class 12 Math 2019 All India Set 1 Solved Paper

Question : 5 of 29

Marks: +1, -0

\cdot

is defined on the set

\mathbb{R}

of all real numbers

b y: a \cdot b = \sqrt{a^2+b^2}

, find the identity element, if it exists in

\mathbb{R}

with respect to

\cdot

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