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LuckyWell [14K]
3 years ago
8

Rewrite with only sin x and cos x. cos 3x

Mathematics
1 answer:
AlladinOne [14]3 years ago
6 0

cos(3x)

cos(2x + x)

cos(2x)cos(x) - sin(2x)sin(x)

[cos²(x) - sin²(x)][cos(x)] - [2sin(x)cos(x)][sin(x)]

cos³(x) - sin²(x)cos(x) - 2sin²(x)cos(x)

cos³(x) - 3sin²(x)cos(x)

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David had a coupon for the grocery store. He started graphing on the x-axis what his total bill would be if he didn’t use the co
Gre4nikov [31]

Answer:

Answer is 68$

Step-by-step explanation:

4 0
3 years ago
If y varies directly as x, and y is 48 when x is 6, which expression can be used to find the value of y when x is 2?
sertanlavr [38]

y = ( 48 *2 ) / 6

Step-by-step explanation:

If y varies directly as x they are directly proportional, which means they relate to each other in the same way....

2 : y = 6: 48

what is y if x = 2?

The value of y can be found if you write it a two fracrions

2 : y = 6 : 48

2 / y = 6 / 48

cross multiply the fractions gives

6*y = 48 *2

divide left and right of the = sign by 6 gives the answer:

y = ( 48 *2 ) / 6

(if you solve it you get y = 12 but that was not the question).

Other method:

multiply left and right of the = sign by y

2 * y/y = y *6 / 48

6y / 48 = 2 * 1

multiply left and right of the = sign by 48

6y * 48/48 = ( 48 *2 )

6y = ( 48 *2 )

divide left and right of the = sign by 6

6/6* y = ( 48 *2 )/6

y = ( 48 *2 ) / 6

(if you solve it you get y = 12 but that was not the question).

4 0
3 years ago
PLEASE HELP NOW PLEASE
kirza4 [7]

Answer:

whats wrong

Step-by-step explanation:

?

3 0
3 years ago
Plzz help plzzzzzzzzzzzz
jok3333 [9.3K]

Answer:

(45*12) + 75 = c

5 0
3 years ago
Read 2 more answers
When you answer can you please tell me why each of the wrong answer choices is wrong, because I'm confused. I know the right ans
fomenos
B which is 0 would be in the range because it is "less than or equal to" 0. 
C is also not in the range though. This problem has more than one right answer. C could be a correct answer as well. 


4 0
3 years ago
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