Pertanyaan:
Nilai dari (3cos(A) - 2sin(A))² + (2cos(A) + 3sin(A))² adalah ...
Langkah Penyelesaian dan Jawaban:
(3cos(A) - 2sin(A))² = 9cos²(A) - 12cos(A)sin(A) + 4sin²(A)
(2cos(A) + 3sin(A))² = 4cos²(A) + 12cos(A)sin(A) + 9sin²(A)
9cos²(A) - 12cos(A)sin(A) + 4sin²(A) + 4cos²(A) + 12cos(A)sin(A) + 9sin²(A)
= 13cos²(A) + 13sin²(A)
= 13(cos²(A) + sin²(A)) ⇒ cos²x + sin²x = 1
= 13(1)
= 13
∴ (3cos(A) - 2sin(A))² + (2cos(A) + 3sin(A))² = 13
=======================
Kelas: X SMA
Mapel: Matematika Wajib
Kategori: Trigonometri
Kode Kategori: 10.2.7
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Trigonometri
Pertanyaan:
Nilai dari (3cos(A) - 2sin(A))² + (2cos(A) + 3sin(A))² adalah ...
Langkah Penyelesaian dan Jawaban:
(3cos(A) - 2sin(A))² = 9cos²(A) - 12cos(A)sin(A) + 4sin²(A)
(2cos(A) + 3sin(A))² = 4cos²(A) + 12cos(A)sin(A) + 9sin²(A)
9cos²(A) - 12cos(A)sin(A) + 4sin²(A) + 4cos²(A) + 12cos(A)sin(A) + 9sin²(A)
= 13cos²(A) + 13sin²(A)
= 13(cos²(A) + sin²(A)) ⇒ cos²x + sin²x = 1
= 13(1)
= 13
∴ (3cos(A) - 2sin(A))² + (2cos(A) + 3sin(A))² = 13
=======================
Kelas: X SMA
Mapel: Matematika Wajib
Kategori: Trigonometri
Kode Kategori: 10.2.7