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" 8."(1)/(sec A+tan A)-(1)/(cos A)=(1)/(...

" 8."(1)/(sec A+tan A)-(1)/(cos A)=(1)/(cos A)-(1)/(sec A-tan A)

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Prove the trigonometric identities: (1)/( sec A+tan A)-(1)/(cos A)=(1)/(cos A)-(1)/(sec A-tan A)

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