Use tables to find the acute angle θ, if the value of cos θ is :

(i) 0.9848

(ii) 0.9574

Use tables to find the acute angle θ, if the value of tan θ is :

(i) 0.2419

(ii) 0.4741

If sin A = $\dfrac{4}{5}$, the value of $\sqrt{\dfrac{1 - \text{cos (90° - A)}}{1 + \text{cos (90° - A)}}}$ is :

1. 1

2. 3

3. $\dfrac{1}{2}$

4. $\dfrac{1}{3}$

(1 + tan² A) × cos² A - 1 is :

1. 1

2. -2

3. 0

4. 2