cos²α+sin²α=1
sinα=√(1-cos²α)
sin α=√(1-9²/15²)=√(1-81/225)=√(144/225)=12/15=4/5
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cos²α+sin²α=1
sinα=√(1-cos²α)
sin α=√(1-9²/15²)=√(1-81/225)=√(144/225)=12/15=4/5