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OpenStudy (anonymous):
anyone know how to do this? Use sum and difference identities to simplify this expression. tan260-tan115/1+tan260tan115
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jimthompson5910 (jim_thompson5910):
look at this trig formula sheet http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf
jimthompson5910 (jim_thompson5910):
look for the section "Sum and Difference Formulas"
OpenStudy (anonymous):
thanks!
jimthompson5910 (jim_thompson5910):
you're welcome
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