Express the statement 1 belongs to the set of natural numbers symbolically_________
Let l(n) = 2cosnx, n belong to natural number then l(1) l(n+1) l(n)
Statement 1: For every natural number n≥2. 1√1+1√2+...+1√n>√n. Statement 2: For every natural number n≥2, √n(n+1)<n+1.