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  4. The value of (( cos 11°+ sin 11°)/( cos 11°- sin 11°)) is

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Q. The value of $\frac{\left(\cos 11^{\circ}+\sin 11^{\circ}\right)}{\left(\cos 11^{\circ}-\sin 11^{\circ}\right)}$ is

Trigonometric Functions

Solution:

$\frac{1+\tan 11^{\circ}}{1-\tan 11^{\circ}}=\tan \left(45^{\circ}+11^{\circ}\right)=\tan 56^{\circ}$