Jawabanmu

2014-05-28T20:50:41+07:00
Sec a = 1/cos a
berarti cos a =1/3
cos a = samping / miring = 1 / 3
samping = 1 ; miring = 3 ; depan" = 3" - 1" ----------->depan" = 8 ------->depan = akar 8 = 2 akar 2
sin a = depan /miring = 2 akar 2 / 3= 2/3 akar 2.
karena sin di kuadran 4 = (-) jadi nilai nya = - 2/3 akar 2

Mudah2an bisa dimengerti