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$\sec\left(x\right)$
Learn how to solve equations problems step by step online. sec x =\frac{cos x}{2\left(1+ sen x\right)}+\frac{cos x}{2\left(1- sen x\right)}. Math interpretation of the question. Find the roots of the equation using the Quadratic Formula. Take the inverse of \sec\left(x\right) on both sides. Apply the formula: \mathrm{arcsec}\left(\sec\left(\theta \right)\right)=\theta .