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=
= cot² α
=
5) 3.sin α + 4.cos α = 5 ⇒ a = 4 ; b = 3
k =
=
=
= √25
= 5
tan A = b/a
= 3/4
A = 36,87°
soal dapat diubah ..
3.sin α + 4.cos α = 5
5 . cos (α - 36,87°) = 5
cos (α - 36,87°) = 5/5
cos (α - 36,87°) = 1
α - 36,87° = 0°
α = 36,87°
sin α = sin 36,87°
= 0,60
catatan : 3.sin α + 4.cos α = k .cos (α - A)