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Plzz fast i have exams

Q. ${\left(\mathrm{sin}\theta +sec\theta \right)}^{2}+\left(\mathrm{cos}\theta +\mathrm{cos}e{c}^{2}\theta \right)={\left(1+sec\theta \mathrm{cos}ec\theta \right)}^{2}$

https://www.meritnation.com/ask-answer/question/prove-sina-seca-2-cosa-coseca-2-2-1-seca-coseca-2here-a-thet/introduction-to-trigonometry/2764447

Regards

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