tana=sina/cosa=-1/3cosa=-3sinasin²a+cos²a=1cosa=3√10/10sina=√10/10sin2a=2sinacosa=2*3√10/10*√10/10=6/10=3/5cos2a=1-2sin²a=1-2(√10/10)²=1-2*1/10=1-1/5=4/5tan2a=sin2a/cos2a=3/5...