Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
Easy$\frac{1-\tan^2 15^{\circ}}{1+\tan^2 15^{\circ}} = ?$
- A$1$
- B$\sqrt{3}$
- C$\frac{\sqrt{3}}{2}$
- D$2$
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