Solve \( 8 \cos (4 x)=2 \) for the smallest three positive solutions. Give your answers accurate to at least two decimal places, as a list separated by commas.

Find an angle \( \theta \) coterminal to \( 1256^{\circ} \), where \( 0^{\circ} \leq \theta<360^{\circ} \)

Find all solutions of the equation \( 2 \cos x-1=0 \). The answer is \( A+B k \pi \) and \( C+D k \pi \) where \( k \) is any integer, \( 0<A<C<2 \pi \), \( A=\square, D=\square \) \( C=\square \)

Solve \( 8 \sin (6 x)=7 \) for the two smallest positive solutions \( A \) and \( B \), with \( A<B \) \( A=\square \) \( B=\square \) Give your answers accurate to at least two decimal places.

Thid an angle 9 coterminal to \( 1066^{\circ} \), where \( 0^{\circ} \leq 0<360 \)

166 Un angolo alla circonferenza ha ampiezza \( \alpha \) e \( \cos \alpha=\frac{8}{17} \). Trova seno e coseno del corrispondente angolo al centro. 808 \( \left[\sin \beta=\frac{240}{289} ; \cos \beta=-\frac{161}{289}\right] \)