Assertion (A): If 0° < A + B ≤ 90°, A > B and cos (A + B) = $\dfrac{1}{2}$ = sin (A - B), then we can say that A = 45° and B = 15°.

Reason (R): sin 60° = cos 60°.

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).

Assertion (A): If ΔABC is equilateral, then cos A + cos B + cos C = sin A + sin B + sin C.

Reason (R): In isosceles right angled triangle ABC, cos A + cos C = sin A + sin C.

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).

Find the values of :

$\dfrac{\text{2 cos}^2 45° + \text{3 tan}^2 30°}{\sqrt{3}\text{cos 30° + \text{sin 30°}}}$

Find the values of :

sec 30° tan 60° + sin 45° cosec 45° + cos 30° cot 60°