Prove:
`(1-cos^2 A)cdot sec^2B + tan^2B (1-sin^2A) = sin^2A+tan^2B`.

Prove : (1-cos^(2)A) *sec ^(2)B + tan^(2)B (1- sin^(2)A) = sin^(2) A + tan^(2)B

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

Prove that: sec^4A(1-sin^4A) -2 tan^2A=1 .

Prove that (i) (sin^(2)A cos^(2)B - cos^(2)A sin^(2) B )=(sin^(2)A- sin^(2)B) (ii) (tan^(2)A sec^(2)B - sec^(2)A tan^(2)B)=(tan^(2)A- tan^(2)B)

sec^(2)A sec^(2)B-sec^(2)A tan^(2)B-tan^(2)A sec^(2)B+tan^(2)A tan^(2)B=

Prove that (1 + sin A) / (cos A) + (cos B) / (1-sin B) = (2sin A-2sin B) / (sin (AB) + cos A-cos B)

Prove that (sec A-tan A)^(2)(1+sin A)=1-sin A

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

Prove: tan^(2)A sec^(2)B-sec^(2)A tan^(2)B=tan^(2)A-tan^(2)B

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