Question 1118353
{{{cos((pi/5)(x+2))=-1}}} has solutions {{{n*pi}}}, n odd
Solve for x:
{{{((pi/5)(x+2))=n*pi -> x+2 = 5n -> x = 5n - 2}}}
On the interval 0&#8804;x<20 the solutions are x = 3 (n=1) and x = 13 (n=3)