**Trigonometric values **of different ratios are very important for the study of relationships between lengths and angles of triangles. The trigonometric values of are commonly used to solve many problems related to triangles.

**Trigonometric ratios of some specific angles**

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**Value of all trigonometric ratios at **

Let . Then Therefore .

Since

, Solving this we get

Since we get that

Now

=

Now

Similarly we can find ,

and .

Now

By using these , we get

etc.