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Principal Solution of Trigonometric Equation

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Show that: $tan 7 x . tan 5 x . tan 2 x = tan 7 x - tan 5 x - tan 2 x$ .

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tan 7 x - tan 5 x - tan 2 x = tan 7 x tan 5 x tan 2 x

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Q. The value of tan 5x tan 3x tan 2x – tan 5x + tan 3x + tan 2x is ____________.

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Principal Solution of Trigonometric Equation

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