81*(1-cos^2a) если sina=5/9
1)81*(1-cos^2a) = 81*(sin^2a)
2)sina=5/9
sin^2a=25/81
3)81*(25/81)=25
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1)81*(1-cos^2a) = 81*(sin^2a)
2)sina=5/9
sin^2a=25/81
3)81*(25/81)=25