Question

Find all theta from (-pi,pi) for which the tangent line of r=tan(theta/2) is horizontal. I have...

Find all theta from (-pi,pi) for which the tangent line of r=tan(theta/2) is horizontal.

I have gotten to

1/2sec^2(theta/2)*sin(theta)+tan(theta/2)*cos(theta)=0

How do I solve for 0?

Math   Calculus   
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