A-Level Further Maths H1-05 Hyperbolic Functions: Identities and Osborne’s Rule

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Totally off topic, but ❤ the T-shirt. Very subtle shoutout.

feekygucker
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A nifty trick noticed by my Y12 student today was that at 2:46, you can rewrite this expression using difference of two squares.

christophermann
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I’m confused as to why you change the tan^2(x) since it’s equivalent to sin^2(x)/cos^2x and yet you don’t change the cos^2(x) which is equivalent to sin^2(x)/tan^2(x).

tomstacey