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Express the ratios cosA, tanA and sec A in terms of sin A.

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As, we know,
`sin^2A + cos^2A = 1=> cos A = sqrt(1-sin^2A)`
`tanA = sinA/cosA = sinA/ sqrt(1-sin^2A)`
`secA = 1/cosA = 1/ sqrt(1-sin^2A)`

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