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3 years ago

98 POINTS! QUESTION + ANSWERS IN PHOTO! Use squared identities to simplify the following equation....

Mathematics

2 answers:

bezimeni [28]3 years ago

8 0

Answer:

the answer is goin to be D

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

cos^2(x) = 1 + cos(2x) /2

2sin^2xcos^2x = 2 * 1- cos(2x)/2 * 1 + cos(2x) /2

(1- cos(2x) * 1+cos(2x))/2

(a-b) (a+b) = a^2 -b^2

(1- cos(2x) * 1+cos(2x))/2 = 1^2 -cos^2(x)/2 *1^2 +cos^2(x) /2

1-cos(4x) /4

~batmans wife dun dun dun....

Harlamova29_29 [7]3 years ago

6 0

2sin^2xcos^2x

Using trig functions we know:

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

cos^2(x) = 1 + cos(2x) /2

Now we have:

2sin^2xcos^2x = 2 * 1- cos(2x)/2 * 1 + cos(2x) /2

Simplify to: (1- cos(2x) * 1+cos(2x))/2

Difference of squares is (a-b) (a+b) = a^2 -b^2

(1- cos(2x) * 1+cos(2x))/2 = 1^2 -cos^2(x)/2 *1^2 +cos^2(x) /2

Multiply to get 1-cos(4x) /4

The answer is D.

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3 years ago

Proximately 32, 800 citizens of the country died in my automobile accident in 2015. Expressed this toll in deaths per day

Anton [14]

Remark
2015 is an odd numbered year. It is not a leap year. It has 365 days in it.

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Givens
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number of days = 365

Sub and solve
32800 = x * 365 Divide by sides by 365
32800 / 365 = x
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Do you round up, down or leave the number as it is?

I would round up 90 deaths per day.

Discussion
Just how much are you out?
Total deaths in a year (rounded) = 90 * 365
Total deaths in a year (rounded)= 32850 which is 50 too many

Suppose you round down
Total death/day = 89 * 365 = 39485 Rounding up is going to be better if you round at all.

Perhaps you should not round the answer at all and leave it at
89.86 <<<<< answer.
If you have choices, please list them.

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3 years ago