prove
`((1-tanA)/(1+tanA))^2 = tan^2A`

prove that ((1-tanA)/(1-cotA))^2=tan^2A

Prove the following identity, where the angles involved are acute angles for which the expressions are defined. (x) ((1+tan^2A)/(1+cot^2A))=((1-tanA)/(1-cotA))^2=tan^2A

Prove: sqrt((1+sinA)/(1-sinA))=secA+tanA

Prove that (1+tanA)^(2)+(1-tanA)^(2)=2sec^(2)A .

Prove: (secA-tanA)/(secA+tanA)=(cos^2A)/((1+sinA)^2)

Prove: (tanA)/((1+tan^2A)^2)+(cotA)/((1+cot^2A)^2)=sinAcosA

(sec A + tan A)/(sec A-tanA) = tan^2(pi/4 + A/2) prove that

If in a triangle ABC, (tanA)/1= (tanB)/2 = (tanC)/3 then prove that 6sqrt(2a)=3sqrt(5b)=2sqrt(10)c

Prove: (secA+tanA-1)(secA-tanA+1)=2tanA

Prove: secA(1-sinA)(secA+tanA)=1