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lara31 [8.8K]
3 years ago
11

How did cos 2x become -cos 2x

Mathematics
1 answer:
Ksju [112]3 years ago
4 0
Cos2x = (cosx)^2-(sinx)^2 so if you have the minus before you have to inverse sign: (sinx)^2-(cosx)^2= -cos2x
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What is the inverse of the function f(x) = 2x + 1?
soldier1979 [14.2K]

Answer: The inverse of the linear function f(x)=2x+1 is f^(-1) (x) = (1/2)x-1/2


Solution

f(x)=2x+1

y=f(x)

y=2x+1

Isolating x: Subtracting 1 both sides of the equation:

y-1=2x+1-1

y-1=2x

Multiplying both sides of the equation by 1/2:

(1/2)(y-1)=(1/2)2x

(1/2)y-1/2=x

x=(1/2)y-1/2

Changing "x" by "f^(-1) (x)" and "y" by "x":

f^(-1) (x) = (1/2)x-1/2

8 0
3 years ago
(-3x)-7+2x+9=5 what does X equal to
yKpoI14uk [10]

Answer:

Step-by-step explanation:

-3x -7 +2x + 9 = 5

-x + 2 = 5  (you are combining like terms here)

-x = 3

x = -3

Hope this helps :)

8 0
3 years ago
Enter the value of n so that the expression (3y+1)+(2y+8) is equivalent to (ny+9)
Mariulka [41]
It will be equivalent to (5y+9)

hope i was able to help and i wasn’t to late.
5 0
3 years ago
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Hahahahahahhhah no links
ohaa [14]

Answer:

Step-by-step explanation:

9-3z+4+6z-2

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6 0
3 years ago
Read 2 more answers
Please help me do number 5
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7 0
3 years ago
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