SOLUTION: Use the given function value and the trigonometric identities to find the exact value of each indicated trigonometric function 0° ≤ 𝜃 ≤ 90°, 0 ≤ 𝜃 ≤ 𝜋 2

Algebra ->  Trigonometry-basics -> SOLUTION: Use the given function value and the trigonometric identities to find the exact value of each indicated trigonometric function 0° ≤ 𝜃 ≤ 90°, 0 ≤ 𝜃 ≤ 𝜋 2       Log On


   



Question 1203868: Use the given function value and the trigonometric identities to find the exact value of each indicated trigonometric function
0° ≤ 𝜃 ≤ 90°, 0 ≤ 𝜃 ≤
𝜋
2
.
sec(𝜃) = 3

(a)
cos(𝜃)

(b)
cot(𝜃)

(c)
csc(𝜃)

(d)
sin(𝜃)


Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
secant(theta) = hypotenuse / adjacent side = 3
if hypotenuse = 3, then adjacent side = 1
pythagorus says that hypotenuse squared minus adjacent side squared = opposite side squared.
this means thqt 3^2 - 1^2 = opposite side squared = 8.
this means that opposite side = sqrt(8)

you have:
adjacent side = 1
opposite side = sqrt(8)
hypotenuse = 3

(a)
cos(𝜃) = adjacent side / hypotenuse = 1/3

(b)
cot(𝜃) adjacent side / opposite sidde = 1/sqrt(8)

(c)
csc(𝜃) = hypotenuse / opposite side = 3/sqrt(8)

(d)
sin(𝜃) = opposite side / hypotenuse = sqrt(8)/3

here's a diagram of the basic trig functions.