`tan((pi)/4+A)=(1+tanA)/(1-tanA)`

Prove that : tan (45^@+A)= (1+tanA)/(1-tanA) .

Prove that : tan (45^@-A)= (1-tanA)/(1+tanA) .

Show that tan (45^(@) - A) = (1 - tanA)/(1 + tanA)

Show that tan(45^@+-A)=(1+-tanA)/(1bar+ tanA)

If A-B=(pi)/(4) , then (1+tanA)(1-tanB)=?

If A and B are acute angles such that tanA=1/2 , tanB=1/3 and tan(A+B)=(tanA+tan\ B)/(1-tanAtanB) , find A+B .

If A=30^(@) , verify that (i) sin2A=(2tanA)/(1+tan^(2)A) (ii) cos2A=(1-tan^(2)A)/(1+tan^(2)A) (iii) tan2A=(2tanA)/(1-tan^(2)A)

If (tanA)/(1-cotA)+(cotA)/(1-tanA)=K+tanA+cotA, then K = ?

If (tanA)/(1-cotA)+(cotA)/(1-tanA)=K+tanA+cotA then K = ?

Prove the following identities: (tanA)/(1-cotA)+(cotA)/(1-tanA)=1+tanA+cotA=1+secAcos e cA