If 0∘<θ<90∘, √sec2θ+cosec2θ =
tan θ + cot θ
tan θ - cot θ
- tan θ + cot θ
- tan θ - cot θ
√sec2θ+cosec2θ =√(1+tan2θ)+(1+cot2θ) =√tan2θ+cot2θ+2tanθcotθ (∵tanθ×cotθ=1) =√(tanθ+cotθ)2 =tanθ+cotθ