2 years ago

Identify whether the following

Mathematics

1 answer:

erik [133]2 years ago

6 0

It opens downwards so it looks like this “n”. That is because a in the formula is a negative number in this situation

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How do I get this answer?

Keith_Richards [23]

Answer:

Step-by-step explanation:

Several trig identities are involved in the proof of this. This is the order in which they are used.

cos(2x) = cos²(x) -sin²(x)
cos²(x) +sin²(x) = 1
cos(x) = 1/sec(x)

<h3>Proof</h3>

Starting with the left side, we can transform it into the right side.

$2\cos(2x)=2(\cos^2(x)-\sin^2(x)) = 2(\cos^2(x)-(1-\cos^2(x)))\\\\=2(2\cos^2(x)-1)=2\left(\dfrac{2}{\sec^2(x)}-\dfrac{\sec^2(x)}{\sec^2(x)}\right)\\\\=\boxed{\dfrac{4-2\sec^2(x)}{\sec^2(x)}}$

4 0

2 years ago

Is 9 odd or even or is 8 an odd number

zzz [600]

Answer:

9 is an odd number and 8 is an even number.

7 0

3 years ago

Read 2 more answers

I need help please thanks

Tom [10]

Answer:

vzosbakabaoabka a

Step-by-step explanation:

ukiukiukiyji

8 0

2 years ago

A park has a length to width ratio of 7:4 and the perimeter of the park is 880 meters. What are the length and width of the park

Schach [20]

Step-by-step explanation:

Ratio of length to width = 7 : 4

length = 7x

width = 4x

7x + 4x = 11x

length = 880

$880 + 4x = 11x$

$880 = 11x - 4x$

$880 = 7x$

$\frac{880}{7} = x$

$125.71 = x$

width = 4x

= 4(125.71)

= 502.85

3 0

2 years ago

In a game, the probability that a spinner will land on blue is 1/4. How many times would you expect to land on blue if you spin

JulijaS [17]

Answer:

2 times

Step-by-step explanation:

8 0

3 years ago