What is cos 7x-cos 3x-sin 7x-2sin 5x-sin 3x equal to-

The correct option is B x cos 7x cos 3xsin 7x 2sin 5x +sin 3x = 2sin 5x sin 2x2(sinxcos 6x sinxcos4x) = 2sin5xsin 2x2sinx(2sin5xsinx) = ...

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Cos(A+B)Cos(A-B)

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Question

What is $\frac{cos 7 x - cos 3 x}{sin 7 x - 2 sin 5 x + sin 3 x}$ equal to?

tan x

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cot x

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tan 2 x

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cot 2 x

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