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If sides a b c of a triangle are in ap then prove that sin² a/2 cosec2a, sin²b/2 cosec 2b, sin²c/2 cosec 2c are in hp

If sides a b c of a triangle are in ap then prove that sin² a/2 cosec2a, sin²b/2 cosec 2b, sin²c/2 cosec 2c are in hp

Grade:11

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