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sin²α+cos²α=1
sin²α+9/49=1
sin²α=1-9/49
sin²α=40/49
sinα=2√10/7
1-cos²α=sin²α
1-3²/7²=sin²α
1-9/49=sin²α
sin²α=40/49
sinα=2√10/7
1-cos²α=sin²α
1-3²/7²=sin²α
1-9/49=sin²α
sin²α=40/49
sinα=2√10/7