TRIGONOMETRI
Pada segitiga siku-siku berlaku dalil phitagoras.
Sin a = a/c
Cos a = b/c
tg a = a/b
cosec a = c/a
sec a = c/b
ctg a = b/a
HUBUNGAN-HUBUNGAN
ctg a = 1/tg a
sec a = 1/cos a
cosec a = 1/sin a
tg a = sin a / cos a
sin2 a + cos2 a = 1
tg2 a + 1 = sec2 a
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