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cos^2(t)+4+4/sec(t) 

Oct 13th, 2015

Thank you for the opportunity to help you with your question!

cos^2(t)+4+4/sec(t)

4/sec(t)=4cos(t)

so we have

cos^2(t)+4+4cos(t)

if you need cos^2(t)+4+4cos(t)=0, then

(cos(t)+2)^2=0

cos(t)=-2

t=cos^(-1)(-2)

t=-22.7degree

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 13th, 2015

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