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Ehsan

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A man can still swim in water at speed 3km/h. He want to cross a river that flows at 2km/h and reach directly opposite to the
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Yeah he can bec 1foot = 12inches so the piece of wood has 3*12 36 inch long so the first piece = 12+5=17 inch the second piece = 7 inch so the last piece = 36-(7+17)=12 inch so do the inequality of triangle (the sum of two sides must be greater than the
tan = sin(x)/cos(x) cot = cos(x)/sin(x) sec = 1/cos(x) (sin(x))^2 + (cos(x))^2 = 1 tan(x)/cot(x) - sec(x)/cos(x) = (sin(x))^2/(cos(x))^2 - 1/(cos(x))^2 = ((sin(x))^2-1)/(cos(x))^2 = (cos(x))^2/(cos(x)^2) = 1 tan(x).sin(x) + cos(x) = (sin(x))^2/cos(x) +

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