tan^2(θ)-sec^2(θ)=cos(-θ)

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

-1=cos(θ)

tan^2(θ)-1-tan^2(θ)=cos(-θ)

-1=cos(-θ)

reference for rules I used:

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

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