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Stella [2.4K]
3 years ago
12

1+cos(18x)=______ Please answer this

Mathematics
1 answer:
Komok [63]3 years ago
8 0

Answer with Explanation:

Keep in mind these trigonometric Identity:

1. Cos²x - Sin² x= Cos 2 x

2. Cos 2 x = 2 Cos²x-1

3. Cos 2 x = 1 - 2 Sin²x

Now, Coming to the Problem

1 + Cos (18 x)

= 1 + Cos (2 × 9 x)

= 2 Cos ² (9 x)→→→ Cos (2 × 9 x)= 2 Cos² (9 x) - 1

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Maksim231197 [3]
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2 years ago
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Help me on this please !
inna [77]

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7 0
2 years ago
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Mice21 [21]

Answer:

Step-by-step explanation:

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