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maka,
sisi tegak= 20
sisi tidur= 15
sisi miring = 25
sin T= sisi dpn/ sisi miring
= 20/25= 4/5 = 0,8
cos T= sisi smping / sisi miring
= 15/25 = 3/5 = 0,6
tg T= sisi dpn/ sisi smping
= 20/15= 4/3