Page 14 - Modul Persamaan Trigonometri
P. 14
0
cos = cos 30
0
Formula 1: = −1 → = 30 + (−1)360 = −330 (TM)
0
0
0
0
= 0 → = 30 + 0 . 360 = 30 (M)
0
0
0
0
= 1 → = 30 + 1 . 360 = 390 (TM)
Formula 2: = −1 → = −30 + (−1)360 = −390 (TM)
0
0
0
0
0
0
= 0 → = −30 + 0 . 360 = −30 (TM)
0
0
0
= 1 → = −30 + 1 . 360 = 330 (M)
0
0
Jadi himpunan penyelesaiannya adalah {30 dan 330 }
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0
0
3. Jika tan = cot 73 dan 0 ≤ ≤ 360 , maka nilai adalah ….
Penyelesaian:
Rumus:
tan = tan
Formula 1: = + . 180
0
tan = cot 73
0
0
0
tan = cot(90 − 17 )
0
tan = tan 17
Formula 1: = −1 → = 17 + (−1). 180 = −163 (TM)
0
0
0
0
0
0
= 0 → = 17 + (0). 180 = 17 (M)
0
0
= −1 → = 17 + (1). 180 = 197 (M)
0
0
0
Jadi himpunan penyelesaiannya adalah {17 dan 197 }