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

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