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Questions  >>  CBSE XI  >>  Math  >>  Trigonometric Functions
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Q)

If $A$ and $B$ are positive acute angle and $\cos A=\large\frac{1}{7},$$\cos B=\large\frac{13}{14}$,then show that $A-B=60^{\large\circ}$

$\begin{array}{1 1}(A)\;\large\frac{1}{2}&(B)\;\large\frac{1}{4}\\(C)\;\large\frac{1}{6}&(D)\;\large\frac{1}{8}\end{array} $

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