Tolong nomor 18 ya makasih
Matematika
Salsaalvinayah45
Pertanyaan
Tolong nomor 18 ya makasih
1 Jawaban
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1. Jawaban bapakdr
sin 150 = sin (180-30) = sin 30 = ½
sin 120 = sin (180-60) = sin 60 = √3/2
cos 120 = cos (180-60) = -cos 60 = -½
cos 300 = cos (360-60) = cos 60 = ½
= (½ + √3/2) / (-½ - ½)
= (½ + √3/2) / (-1)
= -½ - √3/2
= (-1 - √3)/2