3 years ago

Help me please!!!!!!!

Mathematics

1 answer:

NARA [144]3 years ago

6 0

Answer:

sorry can't help hope someone gets it

You might be interested in

I don't need you to work it out, just theorem(s) i need to reach the answer :)

VikaD [51]

Not sure why such an old question is showing up on my feed...

Anyway, let $x=\tan^{-1}\dfrac43$ and $y=\sin^{-1}\dfrac35$ . Then we want to find the exact value of $\cos(x-y)$ .

Use the angle difference identity:

$\cos(x-y)=\cos x\cos y+\sin x\sin y$

and right away we find $\sin y=\dfrac35$ . By the Pythagorean theorem, we also find $\cos y=\dfrac45$ . (Actually, this could potentially be negative, but let's assume all angles are in the first quadrant for convenience.)

Meanwhile, if $\tan x=\dfrac43$ , then (by Pythagorean theorem) $\sec x=\dfrac53$ , so $\cos x=\dfrac35$ . And from this, $\sin x=\dfrac45$ .

So,

$\cos\left(\tan^{-1}\dfrac43-\sin^{-1}\dfrac35\right)=\dfrac35\cdot\dfrac45+\dfrac45\cdot\dfrac35=\dfrac{24}{25}$

7 0

4 years ago

Divide: 27÷77,868 Help

Contact [7]

Answer:

this is the answer unless you did it backwards

Step-by-step explanation:

3.467406380027739e-4

8 0

3 years ago

Twothirds times fifteen

Dmitry [639]

The answer is 10 :) ........

4 0

3 years ago

Read 2 more answers

2(4x - 12) + 3x = 6x + 1 help!! ahh

Anuta_ua [19.1K]

2(4x - 12) + 3x = 6x + 1

Distribute.

8x - 24 + 3x = 6x + 1

Combine like terms.

11x - 24 = 6x + 1

5x = 25

x = 5

8 0

3 years ago

Read 2 more answers

Sue and cows have $20 left for cab fare home because there is three dollars per mile plus $2 fix charge what is the maximum numb

-Dominant- [34]

Answer:

The maximum number of miles they can travel is 6 miles.

Step-by-step explanation:

Because of the fix charge of $2, the amount of money left for the rest of the trip is $18. In order to find how many miles $18 cover when the cab charges $3 per hour, 18 is divided by 3. 18/3=6.

4 0

3 years ago