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Mathematics 21 Online
OpenStudy (anonymous):

help with trig

OpenStudy (anonymous):

OpenStudy (precal):

http://www.youtube.com/watch?v=V1ZKLsDI7Qk

OpenStudy (precal):

this is a great video to show you the identity you are asking about

OpenStudy (campbell_st):

start with sin^2 + cos^2 = 1 divide every term by cos^2 and you'll get your equation... hence proven

OpenStudy (campbell_st):

and you'll need to know tan^2 = sin^2/cos^2 as well as sec^2 = 1/cos^2

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