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How to calculate sec^4 (x) in casio calculator

I'm trying to calculate the integral from -pi/3 to 0 of

sqrt(1+sec^4 (x))dx which is supposed to give me an answer of 2.057 but I get 1.48 everytime. I've trying doing (1/cosx)^4, ((cosx)^4)^-1 and ((cosx)^-1)^4 but no luck.

I have a fx-115ES Plus casio calculator
Original post by AzgarthX
I'm trying to calculate the integral from -pi/3 to 0 of

sqrt(1+sec^4 (x))dx which is supposed to give me an answer of 2.057 but I get 1.48 everytime. I've trying doing (1/cosx)^4, ((cosx)^4)^-1 and ((cosx)^-1)^4 but no luck.

I have a fx-115ES Plus casio calculator


Do it in radians, not degrees.

You should only do calculus with trig functions when the argument is measured in radians.
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Avatar for Gillzy
Gillzy
20
*pretends to know anything about what op is talking about*

Yeah bro like this is basic maths damn can’t believe you didn’t know this huh that’s mad.

(I hate maths)

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