ctgα=−21)tgα=−211+ctg2α=sin2α1=1+(−2)2=1+2=3sin2α=312)sinα=−31cos2α=1−sin2α=1−(−31)2=1−31=323)cosα=32
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ctgα=−21)tgα=−211+ctg2α=sin2α1=1+(−2)2=1+2=3sin2α=312)sinα=−31cos2α=1−sin2α=1−(−31)2=1−31=323)cosα=32