3 years ago

Express the sum or difference as a product: cos 4x - cos 6x

Mathematics

1 answer:

Jobisdone [24]3 years ago

3 0

Cos -2x or -cos2x, it's the difference.

You might be interested in

Which deal is better to buy 5.90 buy 3 books get one free book or 6 for 24.96

maria [59]

Answer:

6 for $24.96

Step-by-step explanation:

$5.90 * 3 = $17.70

Therefore 4 books would be $17.70 because you get one for free

$24.96/6 = $4.16

Therefore if you got 4 books it would be $16.64

So, buying 6 books would be cheaper.

6 0

2 years ago

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

Find the slope and the y-intercept of the graph of the linear equation. y=-7x+12<br><br>

Sever21 [200]

Slope = -7

Y intercept= 13

7 0

1 year ago

Read 2 more answers

Simplify 1/2+2/3-1/4

avanturin [10]

Answer:

11/12

Step-by-step explanation:

5 0

2 years ago

4(x + 3) = 3(3x - 1)

LiRa [457]

X=3
have a great day!

4 0

2 years ago

Read 2 more answers