sec²θ + cosec²θ = ?

প্রশ্ন: sec²θ + cosec²θ = ?
​
​সমাধান:
​sec²θ + cosec²θ
​= (1/cos²θ) + (1/sin²θ)
​= (sin²θ + cos²θ)/(cos²θ. sin²θ)
​= 1/(cos²θ. sin²θ)
​= (1/cos²θ). (1/sin²θ)
​= sec²θ. cosec²θ