7/7 ×7L/7dL
(7mm×7μ)÷(7m×7Å)

7!!-7+PrimeQ(7)+PrimeQ(7)

√(7cosh(ln(7)))+√(7cosh(ln(7)))
7sinh(ln(7))-7-7
sinh(ln(7)/log(7))+cosh(ln(7)/log(7))