DeterminantHard
Question
If AB = O for the matrices
A =
and B = 
then θ - φ is
A =
and B = then θ - φ isOptions
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)
⇒
⇒
⇒ cos (θ - φ)
⇒ cos (θ - φ) = 0
⇒ θ - φ = (2n + 1)
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