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OpenStudy (anonymous):
help with trig
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OpenStudy (anonymous):
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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