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Leonhard Euler (1707-1783)

log(5)/log(10)

log(10)/log(2)

log n

sine and cosine

tangent and cotangent

zeta(2n)(1-1/2^(2n))

zeta(2n)/2^(2n)

the sum of 1/p^(2n)

l.y=sqrt(2) and 10^sqrt(2)

cos l2

log pi

sin 1 and cos 1

s+cot s=(2n+1)pi/2