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

1
sin 165 = sin (90 + 75) = cos 75 ..

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2014-04-30T18:38:43+07:00
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'
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