Jawaban:
4)
tan (3x + 20°) = cot (x - 50°)
tan (3x + 20°) = tan (90° - (x - 50°)
tan (3x + 20) = tan (90° - x + 50°)
tan (3x + 20) = tan (- x + 140°)
3x + 20° = - x + 140°
3x + x = 140° - 20°
4x = 120°
x = 120/4
x = 30°
tidak terdapat pd opsi
tan (2x + 60°) = cot (90° - 3x)
tan (2x + 60°) = tan 3x
2x + 60° = 3x
60° = 3x - 2x
x = 60°
jawaban : c
5) soal sama dengan no.4
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Jawaban:
4)
tan (3x + 20°) = cot (x - 50°)
tan (3x + 20°) = tan (90° - (x - 50°)
tan (3x + 20) = tan (90° - x + 50°)
tan (3x + 20) = tan (- x + 140°)
3x + 20° = - x + 140°
3x + x = 140° - 20°
4x = 120°
x = 120/4
x = 30°
tidak terdapat pd opsi
4)
tan (2x + 60°) = cot (90° - 3x)
tan (2x + 60°) = tan 3x
2x + 60° = 3x
60° = 3x - 2x
x = 60°
jawaban : c
5) soal sama dengan no.4