f´(x)=
f´(x)= 0 for cos x =0
f´(x) have two zeroes on the closed interval [ 0,2π].
x=π/2 and x=3π/2
(sec 12A - 1)/(sec 6A -1) = tan 12A / tan 3A
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f´(x)=
f´(x)= 0 for cos x =0
f´(x) have two zeroes on the closed interval [ 0,2π].
x=π/2 and x=3π/2
