Answers

2014-02-13T19:10:48+05:30
Sin^2 α+cos^2α=1
cos^2α=1-sin^2α=15/16
sin^2α=(1/4)^2=1/16
3+2tg^2α=3+2(sin^2α/cos^2α)
             =3+(2/15)=47/15
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