Differentiate x=sec(y/2)

Can somebody please teach me how to differentiate sec? Is this one that you learn, or can you derive it or work it out?

You learn the rule that:

y = sec f(x), dy/dx = f'(x) sec f(x) tan f(x)

So dx/dy = 1/2 sec (y/2) tan (y/2)

Gamma

Can somebody please teach me how to differentiate sec? Is this one that you learn, or can you derive it or work it out?

dx/dy = (1/2)sec(y/2)tan(y/2)

Standard result in the formulae booklet.

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