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Verified answer
(cos a - sin a)^2 = cos^2 a - 2 sin a cos a + sin^2 a = 1 - 2 sin a cos aVerified answer
Mapel : MatematikaKelas : X SMA
Bab : Fungsi
Pembahasan :
(Cos a - Sin a)²
= (Cos a - Sin a)(Cos a - Sin a)
= Cos²a - 2Sin a cos a + Sin² a
= Sin² a + Cos²a - 2Sin a Cos a
= 1 - Sin 2a