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Verified answer
Bab TrigonometriMatematika SMA Kelas X
sin (π/8) = sin ((π/4)/2)
sin (a/2) = +- √((1 - cos a)/2)
sin ((π/4)/2) → a = π/4
sin (π/8) = √((1 - cos (π/4))/2)
= √((1 - (1/2 √2))/2)
= √((2 - √2)/(2 x 2))
= √((2 - √2)/4)
= (√(2 - √2) : √4)
= (1/2) . √(2 - √2)
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