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Coolmath Precalculus Review Calculus Preview
Lesson 28 - Trigonometry - The Unit Circle and Basic Trig Identities (page 6 of 6)
---- This Precalculus review (Calculus preview) lesson reviews the Unit Circle and basic trigonometric (trig) identities and gives great tips on how to remember everything.

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What about those other guys? Easy.

tan( 4 * pi / 3 ) ... You need ( sin / cos ) ... up and down guy , long , negative ... back and forth guy , short , negative ... sin ( 4 * pi / 3 ) long , negative ( - square root( 3 ) / 2 ) ... cos( 4 * pi / 3 ) , short, negative ( -1 / 2 )

tan( 4 * pi / 3 ) = ( -square root( 3 ) / 2 ) / ( -1 / 2 ) = square root( 3 )

sec( 3 * pi / 4 ) ... Find cos and flip it ... back and forth guy , medium, negative ... cos( 3 * pi / 4 ) , medium, negative , ( -square root( 2 ) / 2 )

sec( 3 * pi / 4 ) = 1 / ( cos( 3 * pi ) / 4 = 1 / ( -square root( 2 ) / 2 ) = -2 / square root( 2 ) = -square root( 2 )

YOUR TURN:

cot( pi / 3 )

csc( -5 * pi / 6 )

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