jika sin a = a/b maka nilai dari sec a adalah

[tex]\sin(a) = \frac{a}{b} \\ \sin(a) = \frac{depan}{miring} = \frac{a}{b} \\ depan = a \\ miring = b \\ samping \: = c \\ \cos(a) = \frac{samping}{miring} = \frac{c}{b} \\ \sec(a) = \frac{1}{ \cos(a) } = \frac{1}{ \frac{c}{b} } = \frac{b}{c} [/tex]

semoga membantu ^^