a. Prove, by counter-example, that the statement sec (A + B) sec A + sec B,
Question:
a. Prove, by counter-example, that the statement sec (A + B) ≡ sec A + sec B, for all A and B is false.
b. Prove that tan θ + cot θ ≡ 2 cosec 2θ, θ ± nπ/2, n ∈ Z.
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Related Book For 
Pearson Edexcel A Level Mathematics Pure Mathematics Year 2
ISBN: 9781292183404
1st Edition
Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran
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