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" 75."(1+cot A+tan A)(sin A-cos A)=(sec ...

" 75."(1+cot A+tan A)(sin A-cos A)=(sec A)/(csc^(2)A)-(csc A)/(sec^(2)A)=sin A tan A-cot A cos A

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Prove the trigonometric identities: (1+cot A+tan A)(sin A-cos A)=(sec A)/(cos ec^(2)A)-(cos ecA)/(sec^(2)A)=sin A tan A-cot A cos A

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