Question

If sin 0= 4/5 in quadrant II, what is cose? A. - 3/5 B. 3/5 C. - 3/4 D. 3/4

Answer 1

A

Explanation:

Given

sinθ =
`(4)/(5)` =
`(opposite)/(hypotenuse)`

This is a 3- 4- 5 triangle

with opposite = 4, adjacent = 3 and hypotenuse = 5

Since θ is in second quadrant then cosθ < 0

cosθ =
`(adjacent)/(hypotenuse)` = -
`(3)/(5)` → A