Selidiki apakah pemyataan berikut benar. b. (sin 135° + cos 225° + sin 250°)/(cos 90° + cos 160°) = 1

Selidiki apakah pemyataan berikut benar.
b. (sin 135° + cos 225° + sin 250°)/(cos 90° + cos 160°) = 1

Jawaban untuk soal tersebut adalah benar.

Pembahasan :

Pada kuadran 2 :
sin (180°-a) = sin a
cos (180°-a) = – cos a
Pada kuadran 3 :
cos (180°+a) = – cos a
sin (270°-a) = – cos a

Pembahasan :
(sin 135° + cos 225° + sin 250°)/(cos 90° + cos 160°) = (sin (180°-45°) + cos (180°+45°) + sin (270°-20°))/(0 + cos (180°-20°))
= (sin (45°) – cos (45°) – cos (20°))/(0 – cos (20°))
= ((1/2)√(2) – (1/2)√(2) – cos 20°)/(- cos 20°)
= (0- cos 20°)/(- cos 20°)
= (-cos 20°)/(-cos 20°)
= 1

Nilai dari (sin 135° + cos 225° + sin 250°)/(cos 90° + cos 160°) = 1

Jadi pernyataan di atas bernilai benar.

 

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