jika sin a =5/13,maka tan a/sec a adalah=

sin a = 5/13
sisi depan = 5
sisi miring = 13
sisi samping = 12

maka
tan a/sec a
= 5/12 : 13/12
= 5/12 * 12/13
= 5/13

Ingat bahwa :
tan = sin/cos
dan
sec = 1/cos

Bisa dituliskan
:
tan a / sec a
= (sin a / cos a) ÷ (1 / cos a)
= (sin a / cos a) x (cos a / 1)
= sin a
= 5/13