Question

Nyantakan dalam perbandingan trigonometri sudut di kuadran 1
a. sin 165 derajat
b. cos 1240 derajat
c. tan 340 derajat
d. sec (-55 derajat)
e. cosec 505 derajat
f. cotan 215 derajat

Answer 1

a. sin 165 derajat = sin (180' - 15') = sin 15'
b. cos 1240 derajat = Cos (3x360' + 160') = cos 160' = cos(180' - 20') = -cos 20
c. tan 340 derajat  = tan (360' - 20') = -tan20'
d. sec (-55 derajat) = Sec(90' - 35') = cosec 35'
e. cosec 505 derajat = cosec(360'+145') = cosec 145' = cosec(180'-35')=cosec35'
f. cotan 215 derajat = Cotan(180' + 35') = cotan 35'