should we remember the value of tan20degree,15degree in applications of trigonometry

Dear Student,

Please find below the solution to the asked query:

We generally remember these values of trigonometric terms  :



There is no need to remember other values , If any question required to to use other values like Sin 20° or tan 15 or Cos 19° .

Then values of these already mention in the given query .
Hope this information will clear your doubts about applications of trigonometry .

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Nope.... only 30°, 45° and 60° is required in most of the cases....
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in applications of trigonometry ... mostly the angles used are 30and 60.  90o can also be usefull but i have not seen 20& 15o any where in the whole chapter
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