verify property (a-b) =(b-a)
42 ,56 (b) 19,17 (c) 91 ,102 (d)39 ,112 (e) 453, 762 (f) 143 ,918
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tan45∘ =cotθtanθ=cotθ
only for θ=π/4.
Hence, θ=45 ∘ or π/4.
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