**Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.2 Question 2**

**2.** Choose the correct option and justify your choice:

You can check **here** values of six trigonometric ratios **(sin, cos, tan, sec, cot and cosec)** for **0, 30, 45, 60 and 90** degrees. You can also learn from this article about how to memorize all the values in an easy way.

**(i)**

(A) (B) (C) tan 60 (D) sin

**Solution:**

is also equal to .

Therefore, answer is **(A).**

**(ii)**

(A) tan 90 (B) 1 (C) sin 45 (D) 0

**Solution:**

Therefore, the answer is **(D)**

**(iii)**

sin 2A = 2 sin A is true when A =

(A) 0 (B) 30 (C) 45 (D) 60

**Solution:**

sin 2(0) = sin 0 = 0

2 sin (0) = 2 x 0 = 0

Therefore, answer is **(A).**

**(iv)**

(A) cos 60 (B) sin 60 (C) tan 60 (D) sin 30

**Solution:**

tan 60 is also equal to

Therefore, the answer is **(C).**