DeterminantHard

Question

If AB = O for the matrices
A = and B = then θ - φ is

Options

A.an odd multiple of
B.an odd multiple of π
C.an even multiple of
D.0

Solution

AB = 0
⇒
⇒
⇒ cos (θ - φ)
⇒ cos (θ - φ) = 0
⇒ θ - φ = (2n + 1)

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