(1+cot² θ)sin² θ
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(1+cot²θ)sin²θ(1+cot²θ)sin²θ(1+cot²θ)sin²θ(1+cot²θ)sin²θ=(1+
(1+cot² θ)sin² θ
(1+cot² θ)sin² θ
(1+cot² θ)sin² θ
(1+cot² θ)sin² θ
=(1+cos²θ/sin²θ)sin²θ
=sin²θ+cos²θ
=1
(1+cot² θ)sin² θ
=sin² θ+cos² θ
=1