cos (A+B) = cosAcosB - sinAsinB
=
= -171/221
catatan = a. gunakan bantuan segitiga
b. kuadran II nilai cos negatif
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cos (A+B) = cosAcosB - sinAsinB
=
=
= -171/221
catatan = a. gunakan bantuan segitiga
b. kuadran II nilai cos negatif