I have to find the first three non-zero terms in the Maclaurin series for the function sec(x).(adsbygoogle = window.adsbygoogle || []).push({});

I guess I have to use the known Maclaurin series for cos(x) and doing 1/cos(x) series with long division. I tried that but didn't get anywere close to the right answer. Could anyone please help me?

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# MacLaurin series

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