Question

If a +b = 45 prove that tan a

Answer 1

Answer:

a = 45 - b

tan a = tan (45-b)

Put tan (a -b) formula,

tan (a-b) = tan a - tan b/1+tana×tan b

So,

tan (45-b)

= tan 45 - tan b/1+ tan 45× tanb

= 1 - tan b/1 + tan b