(sinA.tanA)/(1 - cos A) - 1 is equal to ______.

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(sinA.tanA)/(1 - cos A) - 1 is equal to sec A. Explanation: We know, tan A = sin A/cos A `(sin A.(sin A/cos A))/(1 - cos A) - 1 (sin^2 A/cos A)/(1 - cos A) - 1` cos A from the numerator to the denominator: `sin^2 A/(cos A(1 - cos A)) - 1 (1 + cos A)/cos A- 1 (1/ cos A + cos A/cos A) - 1` sec A + 1 − 1 sec A

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