1. Suppose delta > 0.
(a) Prove that there exists a positive integer n such that
0 < 1/((4n+1)pi/2) < delta
and sin ((4n+1)pi/2) = 1
(b) Prove that there exists a positive integer m such that
0 < 1/((4m+3)pi/2) < delta
and sin ((4m+3)pi/2) = -1
see if anyone can do it,