- Home
- Standard 11
- Mathematics
3.Trigonometrical Ratios, Functions and Identities
easy
यदि $\tan \theta = \frac{{20}}{{21}},$ cos$\theta$
A
$ \pm \frac{{20}}{{41}}$
B
$ \pm \frac{1}{{21}}$
C
$ \pm \frac{{21}}{{29}}$
D
$ \pm \frac{{20}}{{21}}$
Solution
(c)$\tan \theta = \frac{{20}}{{21}} \Rightarrow \cos \theta = \pm \frac{{21}}{{29}}$.
Standard 11
Mathematics