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Nutka1998 [239]
3 years ago
12

Cos^2 2x−cos^2 6x=sin4x sin8x please help me prove it

Mathematics
1 answer:
Olin [163]3 years ago
4 0
Cos² 2x = (1+cos 4x )/2
cos² 6x  = (1+cos 12x)/2
subtract to get  1/2 (cos 4x - cos 12x )   
=  1/2 (2 sin  4x sin 8x )       as cos A - cos B =  2 [ sin (A+B)/2  sin (A-B)/2 ]
so the answer
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The table below shows the number of invertebrates found in a tide pool. Find the ratio of crabs to the total number of invertebr
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Answer:

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3 0
3 years ago
A jet plane can carry up to 200,000 liters of fuel. It used 130,000 liters of fuel during a flight. What percentage of the fuel
-Dominant- [34]

Given:

Capacity of jet plane = 200,000 liters of fuel

Fuel used during flight = 130,000 liters

To find:

The percentage of the fuel capacity it uses on this flight.

Solution:

According to the question, we need to find 130,000 is what percent of 200,000.

\text{Required percentage}=\dfrac{\text{Fuel used during flight}}{\text{Capacity of jet plane}}\times 100

\text{Required percentage}=\dfrac{130000}{200000}\times 100

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Therefore, the jet plane uses 65 percent of fuel capacity during flight.

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