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Write the value of
Consider
=
(
∵
1 + tan
2
θ = sec
2
θ and 1 + cot
2
θ = cosec
2
θ)
= 1
15
= 
(∵1 + tan2 θ = sec2 θ and 1 + cot2 θ = cosec2 θ) = (∵1 + tan2 θ = sec2 θ and 1 + cot2 θ = cosec2 θ)