3 years ago

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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