Question 1026449
Understanding Zero Product rule is necessary and knowing the functions on the Unit Circle might be a good idea - or just understand that concept and use a calculator.


{{{tan(theta)-4=0}}}
{{{tan(theta)=4}}}
theta=arctan(4), {{{theta=76*degrees}}}


OR

{{{9*sin^2(theta)-1=0}}}
{{{9*sin^2(theta)=1}}}
{{{sin^2(theta)=1/9}}}
{{{sin(theta)=0+- 1/3}}}-----which may give four possible answers for this one.
The quadrant 1 value would be about 19.47 degrees.