Listen NCERT Audio Books to boost your productivity and retention power by 2X.
Evaluate each of the following:
Firstly, tan = tan
……(i)
Also, coscos
cos
……(ii)
From (i) and (ii),
becomes,
Now,
We know that, for any x R,
represent an angle in
whose tangent is x.
We know that, for any x [-1, 1],
represent an angle in
whose cosine is x.
Hence,
Therefore, Principal Value of is 0.