Hello! Please help!! I really need this.
2 answers:
Answer:
<u>Lets show that:</u>
- cos x cos 2x cos 4x cos 8x = sin 16x / 16 sinx
<u>Use formula:</u>
<u>Multiply LHS by 2sinx/2sinx:</u>
- 2sinx cos x cos 2x cos 4x cos 8x / 2 sin x =
- sin 2x cos 2x cos 4x cos 8x / 2 sin x =
- 2sin 2x cos 2x cos 4x cos 8x / 4 sin x =
- sin 4x cos 4x cos 8x / 4 sin x =
- 2sin 4x cos 4x cos 8x / 8 sin x =
- sin 8x cos 8x / 8 sin x =
- 2 sin 8x cos 8x / 16 sin x =
- sin 16x / 16 sin x
<u>Now, we can easily find that:</u>
- sin (16*2π/15) = sin (2π/15)
<u>Coming back to the original equation, we get:</u>
- cos (2π/15) cos (4π/15) cos (8π/15) cos (16π/15) = sin (16*2π/15) / 16 sin (2π/15)
- cos (2π/15) cos (4π/15) cos (8π/15) cos (16π/15) = 1/16
its a i did this a while ago
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Hope this helped!!!!!
Answer:
Intersection of the two lines.
i am not sure
but I think it is a
<u>Answer</u>
7/729
<u>Explanation</u>
The question requires to you to find the value of x.
9³x = 7
729 x = 7
x = 7/729
Answer:
2^5
Step-by-step explanation:
64 = 2*16 = 2*2*8 = 2*2*2*4 = 2*2*2*2*2 = 2^5