My doctor challenged me to solve this integral and I tried my best, please help me ?! $$ \int \frac{1}{\cos \theta}\, d\theta $$
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The substitution $t = \tan(\theta/2)$ might work. – 1123581321 Jan 12 '21 at 10:05
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2@Nova3335 I'm sure he'd prefer that you solve the challenge by yourself. – PierreCarre Jan 12 '21 at 10:11