Answer :
To find: (1 + cot θ − cosec θ) (1 + tan θ + sec θ)
Consider (1 + cot θ − cosec θ) (1 + tan θ + sec θ)
[∵ (a – b) (a + b) = a2 – b2]
[∵ sin2 θ + cos2 θ = 1]
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