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Verified answer
Sin 2x = -cos π/4-cos π/4 = -cos 45=- 1/2 (akar2)
Sin 2x = - 1/2 (akar2)
Sin 2x = sin 225 ( nilai sin negatif)
Dgn menggunakan rumus
2x = 225 +k(0)
X =112.5