Question

Hitunglah nilai dari sin 22,5!

pake cara​

Answer 1

Jawaban:

sin (22,5) = 0,487175.

Answer 2

Jawaban:

Cos 2A = 1 - 2 sin²  A

2 sin² A = 1 - cos 2A

sin² A = 1/2 - 1/2 cos 2A

sin A = √{1/2 - 1/2 cos 2A}

sin22,5 = √{1/2 - 1/2 cos 45}

sin22,5 = √(1/2 - 1/2(1/2 √2)

sin22,5 = √(1/2 - 1/4√2)

sin 22,5= √{1/4 (2 -√2)}

sin 22,5 = 1/2  √(2 - √2)