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If `A+B+C=pi`, n `cotAcotB+cotBcotC+cotCcotA` is equal to
Solution:
Let us assume any value of A, B and C such that `A+B+C=pi`
Let, `A=B=C=pi/3`, we get,
`1/root()(3)*1/root()(3)+1/root()(3)*1/root()(3)+1/root()(3)*1/root()(3)=1`
If A has 5 elements , then the number of proper subset of A is
If A is a square matrix, which of the following is true ?
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