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il63 [147K]
2 years ago
11

Prove that Cos4x=8Cosx -8Cosx​

Mathematics
1 answer:
harkovskaia [24]2 years ago
8 0
Please see the image attached

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Your friend has built the skate board ramp shown in the figure with sides of 16 in., 63 in., and 65 in. that he claims has dispr
nexus9112 [7]
The friend is wrong - According to the Pythagorean Theorm, if c is the hypotenuse and a and b are opposite sides then  c^{2} = a^{2}  +  b^{2} 
if c=65 inches, a=16 inches and b = 63 inches, then
 65^{2} =16 ^{2} +  63^{2}
right hand side of the equation = 256 + 3969 = 4225
left hand side of the equation = 65^{2}= 4225
So we see, left hand side = right hand side
Hence the theorm is proved.




5 0
3 years ago
Pls help me :( I’ll give u brainliest
Naya [18.7K]

Answer: 私は笑を理解していませんが、私は円周率が必要です

Step-by-step explanation: 私は笑を理解していませんが、私は円周率が必要です

8 0
3 years ago
When 0.3(4x – 8) – 0.5(–2.4x + 4) is simplified, what is the resulting expression?
andrew-mc [135]

Answer:

=2.4x-4.4  

Step-by-step explanation:

did the test

0.3(4x-8)-0.5(-2.4x+4)

=1.2x-2.4-0.5(-2.4x+4)

=1.2x-2.4+1.2x-2

=2.4x-4.4

5 0
3 years ago
Read 2 more answers
How many 12/4 are in 3
Anit [1.1K]

Answer:

There is one 12/4 in 3.

Step-by-step explanation:

12/4 = 3

4/4 + 4/4 + 4/4 = 12/4 = 3

8 0
3 years ago
A right triangle has sides of length 3, 4, and x. Find x if it is one of the legs
lianna [129]
I think it might be 5, because it is a pythagrum triple
6 0
3 years ago
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