Posted by **shameel** on Monday, February 4, 2008 at 11:46am.

how can the value of tan30 be found?

- math -
**Sara**, Monday, February 4, 2008 at 1:31pm
ou need to know first of all that tanx=sinx/cosx

You will also need to know that:

sin0=0

sin30=1/2

sin45=sqrt[2]/2

sin60=sqrt[3]/2

sin 90 =1

and

cos0=1

cos30=sqrt[3]/2

cos 45=sqrt[2]/2

cos60=1/2

cos90=0

so you can recognize that 1/sqrt[3] corresponds to tan30, since tan30=sin30/cos30

=1/2/sqrt[3]/2 = 1/sqrt[3]

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