the trigonometric ratios as defined:
(i) cot? A - cos2 A = cot? A cos2 A
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Solving LHS,
→cot²A - cos²A
= cos²A/sin²A - cos²A
= cos²A(1-sin²A)/sin²A
→ 1-sin²A = cos²A
=cos⁴A/sin²A
=cos²A.cos²A/sin²A
=cos²A.cot²A (RHS)
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