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[" 10.Prove that: "],[qquad [" (i) "tan^...

[" 10.Prove that: "],[qquad [" (i) "tan^(2)A-sin^(2)A=tan^(2)A*sin^(2)A]]

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prove that tan^(2)A-sin^(2)A=tan^(2)A*sin^(2)A

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