For `\sin 2x+\cos x =0, `
use a double-angle or half-angle formula to simplify the equation and then
find all solutions of the equation
in the interval ` [0,2\pi). `
The answers are
`x_1=`
,
` x_2=`
,
`x_3=`
and
` x_4=`
with `x_1 lt x_2 lt x_3 lt x_4`.
Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Box 2: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Box 3: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Box 4: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity