Question

trigonometry
class 10​

Answer 1

Step-by-step explanation:

LHS= [(1+cos A)/ sin A]²

= (1+cos A)²/ sin²A

= (1+cos A)²/ (1-cos A)²... sin²A= 1-cos²A

= 1+cos A/ 1- cos A .... a²-b² = (a-b)(a+b)

= RHS

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