Question

Find value of cos pi/8 find the value of
Cos pi/8

Answer 1

Answer:

cos pi/8 =cos pi/4/2

Step-by-step explanation:

cos pi/4=cos45=1/√2

cos pi/4/2=√1+cos pi/4/2

=√1+1/√2/2

=√√2+1/2√2