Question

If $\tan \theta =\frac{3}{4}$, then cos² θ − sin² θ =

(a) $\frac{7}{25}$
(b) 1
(c) $\frac{-7}{25}$
(d) $\frac{4}{25}$

Answer 1

Given that:

Since

We know that and

We find:

Hence the correct option is