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August 29, 2015

Homework Help: trig

Posted by Evelina on Wednesday, November 30, 2011 at 11:33am.

I need to count this:
a) 1-tg^2a/1+ctg^2a, when sina =2/3
b) 1-tg^2a/1-ctg^2a, when cosa= -1/3
c) tga * cos^2a, when sina + cosa=5/7
d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5

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