[" Question numbers "23" to "30" carry "...

[" Question numbers "23" to "30" carry "4" marks each."],[[" 23.Prove that "(tan^(2)A)/(tan^(2)A-1)-(cos ec^(2)A)/(sec^(2)A-csc^(2)A),=(1)/(1-2cos^(2)A)],[" 24.The first term of an "AP" is "3" ,the last term in "9.]]

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