Question

Tentukan nilai trignometri berikut;
sin 150 derajat
cos 225 derajat
tan 330 derajat
cosec 45 derajat
cot 120 derajat
sec 135 derajat
tan (-45 derajat)
sin 450 derajat

Answer 1

Sin 150 <=> sin (180 - 30) = sin 30 = 1/2
cos 225 <=> cos (180+45) = - cos 45 = -1/2 akar 2
tan 330 <=> tan (360 - 30) = - tan 30 = 1/3 akar 3
cosec 45 = akar 2
cot 120 <=> cot (180 - 60) = - cot 60 = - 1/3 akar 3
sec 135 <=> sec (180 - 45) = - sec 45 = - akar 2
tan (-45) = -1
sin 450 <=> sin (360 + 90) = sin 90 = 1