Find cos(76n).
Find sec(23n)
cos(76pi)=cos(74pi)=...=cos(2pi)=cos0=1
sec(23pi)=sec(21pi)=...=sec(3pi)=sec(pi)= -1
because the period T=2pi
(If pi=n)
Find sec(23n)
sec(23pi)=sec(21pi)=...=sec(3pi)=sec(pi)= -1
because the period T=2pi
(If pi=n)