Question

3.
Q7. Write the formula of cos 3x in terms of tanx
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Answer 1

Answer:

Let us discuss how this formula is derived. => cos(3x) = (2cos^2(x)-1)cos(x)-sin(x)2sin(x)cos(x). => cos(3x) = 2cos^3(x)-cos(x)-2sin^2(x)cos(x).

Step-by-step explanation:

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