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3) (cos A)/(1-sin A)+(sin A)/(1-cos A)+1...

3) `(cos A)/(1-sin A)+(sin A)/(1-cos A)+1=`

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(i) (1-cos A)/(sin A)=(sin A)/(1+cos A)

(1-cosA)/(sin A)=(sin A)/(1+cos A

Prove that : (cos A)/ (1 - tan A) + (sin A)/ (1- cot A) = sin A + cos A

Prove that : (cos A)/ (1 - tan A) + (sin A)/ (1 - cot A) = cos A + sin A

(cos A)/(1-sin A)=(1+cos A+sin A)/(1+cos A-sin A)

Prove that: ((1+ cos A)/(sin A))^(2)= (1 + cos A)/(1-cos A)

(1- sin A - cos A)^2 = 2 (1-sin A) (1-cos A)

Prove the following identities : (sin A + cos A)/ (sin A - cos A) + (sin A - cos A)/ (sin A + cos A) = (2)/ (2 sin^(2) A - 1)

If A = 30^(@) , show that : (i) (1 + sin 2A + cos 2A)/(sin A + cos A) = 2 cos A (ii) (cos^(3)A - cos 3A)/(cos A) + (sin^(3)A + sin 3A)/(sin A) = 3

Prove the following identities : (1)/ (cos A + sin A) + (1)/(cos A - sin A) = (2 cos A)/(2 cos^(2) A - 1)