Found this, maybe it helps
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Answer:
Step-by-step explanation:
Cos x = -12/13
sin x = -sqrt(13^2 - 12^2) / 13 = -5/13
tan x = 5/12
tan x/2 = (1 - cos x) / sin x = 1 - (-12/13) / -5/13 = 25/13 * -13/5 = -5
2sin^2 x/2 = 1 - cos x = 1 - (-12/13) = 25/13
sin^2 x/2 = 25/13 / 2 = 25/26
sin x/2 = 5/√26
sin x/2 / cos x/2 = tan x/2
cos x/2 = sin x/2 / tan x/2 = 5/√26 / -5 = -1/√26
sin x/2 = 5/√26
cos x/2 = -1/√26
tan x/2 = -5
A , because you have to divide it so you can get the correct answer
The value of y when x = 10 is 22.5 ⇒ 1st answer
Step-by-step explanation:
Direct variation is a relationship between two variables that can
be expressed by an equation in which one variable is equal to a
constant times the other
If y varies directly with x, then
- y ∝ x
- y = k x, is the equation of variation where k is the constant of variation
∵ y varies directly with x
∴ y ∝ x
∴ y = k x
To find k substitute x and y by their initial values
∵ y = 9 and x = 4
- Substitute y by 9 and x by 4 in the equation above
∴ 9 = k(4)
- Divide both sides by 4
∴ 2.25 = k
∴ The value of k is 2.25
- Substitute the value of k in the equation above
∴ y = 2.25 x ⇒ equation of variation
∵ x = 10
- To find y substitute x by 10 in the equation of variation
∵ y = 2.25(10)
∴ y = 22.5
∴ The value of y is 22.5
The value of y when x = 10 is 22.5
Learn more:
You can learn more about variation in brainly.com/question/10708697
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