Question

tan a is equal to root 2 minus 1 show that sin a into cos A is equal to root 2 by 4

Answer 1

Answer:

Step-by-step explanation:

Yes.

Draw ∆ABC , right angled at b.

Now,

CB = √2-1 , AB= 1.

Ac^2 = Ab^2 + Bc^2

= 1^2 + (√2-1)^2

= 4-2√2.

So, AC = Root Under 4-2√2.

Now, look at the picture.