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→Useful websites
=Additional Information=
=Additional Information=
==Useful websites==
==Useful websites==
#[http://www.mathsisfun.com/algebra/trigonometry.html - fundamentalconcept of angle in trignometry] this web describes trignometrical functions
# below video give basic idea of trignometry
{{#widget:YouTube|id=T8B8Tcz8kog}}
==Reference Books==
==Reference Books==