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natita [175]
3 years ago
14

Prove cos(^2)x-sin(^2)x=1-2sin(^2)x

Mathematics
1 answer:
aleksley [76]3 years ago
4 0

Answer:

Step-by-step explanation:

cos^2x-sin^2x=1\\\\cos^2x+sin^2x=1\\\\so~cos^2x=1-sin^2x\\cos^2x-sin^2x=1-sin^2x-sin^2x=1-2sin^2x

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There were 27,000 people at a ball game in Los Angeles. The day's receipts were $204,000. How many people paid $13 for reserved
Studentka2010 [4]
21000 people paid for general admission and 6000 paid for reserved seats. This is solved by making 2 equations. Out of 27000 people who were at game, x of them paid for general admission and y for reserved seats, thus
x + y = 27000
As said, daily receipts were 204000$. As reserved seat is 13$, y of them gave 13$ each (y*13$) and x of them gave 6 for general admission(x*6) and those two add up and we get second equation
13y + 6x = 204000.
This can be solved by transforming first equation into x = 27000 - y and then replacing the x in second.
13y + 6*(27000 - y) = 204000
13y + 162000 - 6y = 204000
7y = 42000
y = 6000
x + 6000 = 27000
x = 27000 - 6000 = 21000
5 0
3 years ago
Which numbers are integers and which are not<br> 71,-9,-42/7,-94.8,19/5
Liula [17]

Answer:

Step-by-step explanation: integers are whole numbers , it could be positive or negative.

Therefore 71 and - 9 are integers

- 42/7 written in this form is a Rational number , but when divided , it will give -6 which is an integer.

-94 . 8 is not an integer

19/ 5 is not an integer, it is a rational number

8 0
3 years ago
Read 2 more answers
12=4/5g please show how to solve. Thanks
Radda [10]
Hi.
12=4/5g
12*5=4g
60=4g
60/4=g
g=15.
6 0
3 years ago
Solve for the variable in 7⁄28 = 25⁄x A. 20 B. 100 C. 4 D. 5
LenaWriter [7]
7/28 = 25/x
x = (25 × 28)/7
x = (25 × 4)
x = 100

5 0
3 years ago
Read 2 more answers
Timothy can catch a fish in 5 minutes on a lake. Rayna can catch one in 9 minutes. If they both start catching fish the same tim
ivolga24 [154]

Answer:

45

Step-by-step explanation:

I believe in 45 minutes

8 0
3 years ago
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