Question

2cos (y) + 5sin (y) cos (y) = 0.

Find all the angles between 0 and 360 that satisfy this equation. please show any working :)

Answer 1

\[2\cos (y) + 5\sin (y) \cos (y) = 0 \]
\[\cos(y)(2+5\sin(y))=0\]
\(cos(y)=0\) or \(2+5\sin(y)=0\)

\(cos(y)=0\) or \(\sin(y)=-\frac{2}{5}\)
can you do it yourself now?