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depan = √(13² - 12²) = 5
di kuadran 2, cot bernilai negatif
cot a = - (samping/ depan) = - 12/5
+ sin² α = 1
+ sin² α = 1
sin² α = 1 -
sin² α =
sin α =
sin α =
α terletak diantara kuadran I dan kuadran II
untuk α di kuadran I
cot α =
=
= x
=
= 2
untuk α di kuadran II -----> cot bernilai -
cot α = - 2