11th maths chapter 2
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Step-by-step explanation:
LHS
=(sin²A/cos²A)-sin²A
=sin²A-sin²Acos²A/cos²A
=sin²A(1-cos²A)/cos²A
=sin⁴A/cos²A
=sin⁴A.1/cos²A
=sin⁴A sec²A
RHS
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