![[最も共有された！ √] tan^2x formula 505455-Tan 2x formula in terms of cos x](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tuLkiUt6KmoNiQzZ0oLjgdizGasgC7J5F6DIa8sYVDQizPqSPycPjHXqdymFYCKYMfRkJ4b9cc3vEjy4fzFywZCrS7w5UoNfc76zxO9jqRQ5E=w400-h300-n-k-no-nu)
The Pythagorean formula for tangents and secants There's also one for cotangents and cosecants, but as cotangents and cosecants are rare...
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