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Let's practise the basics

Calculus Level 5

Find the minimum of

\[\left[ \frac{(\sin{t}+2)^2}{\cos^2t}+\frac{3\cos^2t}{(\sin{t}+2)^2} \right]^2.\]

From a calculus exam I recently gave.

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

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including olympiad champions, researchers, and professionals.

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by Otto Bretscher

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