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[tex]\displaystyle \cos2(75)=1-2\sin^275\\\cos150=1-2\sin^275\\p=1-2\sin^275\\2\sin^275=1-p\\\sin^275=\frac{1-p}2\\\boxed{\boxed{\sin75=\sqrt{\frac{1-p}2}}}[/tex]

Bab Trigonometri
Matematika SMA Kelas X

Sin 75° = sin (150°/2)
Sin (a/2) = √((1 - cos a)/2)
Sin 75° = √((1 - cos 150)/2)
Sin 75° = √((1 - p)/2)

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