If cos 62° 40' = x, the value of 1 + sin² 27° 20' is :

1. 1 + x²

2. 1 - x²

3. x² - 1

4. 1 + x

If cos 63° 36' = 0.4446, the value of sin 26° 24' is :

1. 1

2. 1 + 0.4446

3. 0.4446

4. 1 - 0.4446

Use tables to find sine of :

(i) 21°

(ii) 34° 42'

(iii) 47° 32'

(iv) 62° 57'