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sin(2x - π/4) = 1/2 √2
sin(2x - π/4) = sin(45)
2x - π/4 = 45
2x - 45 = 45
2x = 90
x = 45
atau
sin(2x - π/4) = 1/2 √2
sin(2x - π/4) = sin(135)
2x - π/4 = 135
2x - 45 = 135
2x = 180
x = 90
b.
cos(3x) = 1/2
cos(3x) = cos(60)
3x = 60
x = 20
atau
cos(3x) = 1/2
cos(3x) = cos(300)
3x = 300
x = 100
c.
tan(2x - π/6) - 1 = 0
tan(2x - π/6) - 1 = tan(0)
2x - π/6 - 1 = 0
2x - 30 = 1
2x = 31
x = 15,5
atau
tan(2x - π/6) - 1 = 0
tan(2x - π/6) - 1 = tan(180)
2x - π/6 - 1 = 180
2x - 30 = 181
2x = 211
x = 105,5
atau
tan(2x - π/6) - 1 = 0
tan(2x - π/6) - 1 = tan(360)
2x - π/6 - 1 = 360
2x - 30 = 361
2x = 391
x = 195,5
untuk bagian d, e, dan f. sama yak cara kerjanya.
menurut aku jalan kerjanya seperti itu.