Question

without using trigonometry table find sin 15 degree cos 15 degree​

Answer 1

Answer:

Step-by-step explanation:

Sin15° = sin(45°-30°)

Using:

sin(A-B) = sinA cosB - cosA sinB

Where A = 45° & B = 30°

Putting these values.

Sin15° = 1/√2 * √3/2 - 1/√2 * 1/2

= √3/2√2 - 1/2√2

= (√3-1)/ 2√2