1/cos²α=1+tg²α=1+36=37⇒cosα=1/√37=√37/37
sin a=tgα*cosα=6*√37/37
ctgα=1/tgα=1/6
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1/cos²α=1+tg²α=1+36=37⇒cosα=1/√37=√37/37
sin a=tgα*cosα=6*√37/37
ctgα=1/tgα=1/6