Let's think of this angle being put inside of a unit circle (a circle with a radius of one). This angle is going to stay inside the first quadrant, so all of its trigonometric ratios will be positive.

We are given that the sin of x is 1/5. To get the x by itself, we can just find the inverse sine of both sides to isolate the x.

x=sin $^-1$ (1/5)

x≈ 11.536959

2x≈ 23.073918

Now, we just cosine this value.

cos2x≈ 0.92

I hope that this helps! Have a wonderful day!

3 0

3 years ago

2+ – 2c+ – 9c^2 <br> what is the answer

AlexFokin [52]

Replace all occurrences of + − with a single − . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because 1 ⋅ − 1 = − 1 2 − 2 c − 9 c 2

3 0

3 years ago

Sid has £5 to buy apples and bananas.

Simora [160]

He buys 18 apples = £1.08
He can buy 9 bananas

8 0

3 years ago

Read 2 more answers

Find the midpoint of the line segment whose endpoints are (-2, 5) and (4, -9).

daser333 [38]

Solving for the midpoint can be done by looking for the average of each of the given x-coordinates and y-coordinates. The 2 obtained averages are the new x-coordinate and y-coordinate. This shown below:

Midpoint = ( (-2 + 4)/2 , (5 + -9)/2 )
Midpoint = (1,-2)

Therefore, the new midpoint is (1,-2)

6 0

3 years ago