If , then show that…

MATHEMATICS · Subjective · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

If

2 \cos A = x + \frac{1}{x}

,

2 \cos \beta = y + \frac{1}{y}

then show that

2 \cos(A - B) = \frac{x}{y} + \frac{y}{x}

.

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