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(cot A-1)/(2-sin^(2)A)=(cot A)/(1+tan A)...

(cot A-1)/(2-sin^(2)A)=(cot A)/(1+tan A)

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(cot A-1)/(2-sec^(2)A)=(cot A)/(1+tan A)

(cot A-1)/(2-sec^(2)A)=(cot A)/(1+tan A)

(cot A-1)/(2-sec^(2)A)=(cot A)/(1+tan A)

(cot A-1)/(2-sec^(2)A)=(cot A)/(1+tan A)

Prove that : (cot A - 1)/ (2 - sec^(2) A) = (cot A)/ (1 + tan A)

(tan A) / (1-cot A) + (cot A) / (1-tan A) = 1 + tan A + cot A = 1 + sec A cos ecA (1 + cos theta + sin theta) / (1 + cos theta-sin theta) = (1 + sin theta) / (cos theta)

Prove that: (tan A)/(1+tan^2A)^2 + (cot A)/(1+cot^2A)^2 = sin A cos A .

(tan A)/((1+tan^(2)A)^(2))+(cot A)/((1+cot^(2)A)^(2))=sin A cos A

cot A=(1)/(2)(cot((A)/(2))-tan((A)/(2)))