 admin # Solve the equation 2 cos x + 1 = 0 , 0 <= x <= 2pi PLEASE HELP! WILL AWARD!

2 months ago

## Solution 1 Guest #3312
2 months ago
It would be pi over 6, 5 pi over 6, and 3 pi over 6.

## Solution 2 Guest #3313
2 months ago
Im not saying its right but I got 0,3,3,and2π  f(x)=2cos2xcosx−1=0
Solve this quadratic equation for cos x.
Since a + b + c = 0, use shortcut.
One real root is cos x = 1 and the other is cosx=ca=−12.
Trig table and unit circle -->
a. cos x = 1 --> arc x = 0, and arc x=2π
b. cosx=−12 --> arc x=±3
The arc −2π3 is co-terminal to the arc: 3
0,3,3,and2π

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Step-by-step explanation:

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Solution 1

Step-by-step explanation:

they are literally the same thing.

Solution 2
I was told the answer was 375mm3

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The stack on the left is made up of 15 pennies, and the stack on the right is also made up of 15 pennies. If the volume of the stack of pennies on the left is 390 mm3, what is the volume of the stack of pennies on the right in cubic millimeters?
Solution 1

Answer:  The required volume is 390 mm³.

Step-by-step explanation: Given that the stack on the left is made up of 15 pennies, and the stack on the right is also made up of 15 pennies. The volume of the stack of pennies on the left is 390 mm³.

we are to find the volume of the stack of pennies on the right in cubic millimeters.

The number of pennies on the left and right are same, equal to 15.

Also, the volume of the stack of pennies on the left is 390 mm³.

Since the number of pennies on the right and left are equal, so the volume of the stack on the right and left are also equal.

Therefore, the volume of the stack of pennies on the right is 390 mm³.

Thus, the required volume is 390 mm³.

Solution 2

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Solution 1 Step-by-step explanation:

Cavalieri’s Principle: If in two solids of equal altitude, the sections made by planes parallel to and at the same distance from their respective bases are always equal, then the volumes of the two solids are equal.

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