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sin^2 alfa+cos^2 alfa=1
(3/5)^2+cos^2 alfa=1
9/25+cos^2 alfa=1
cos^2 alfa=1 - 9/25
cos^2 alfa=16/25
cos alfa=4/5
sin^3 alfa+cos^3 alfa=(3/5)^3+(4/5)^3=27/125+64/125=91/125