Question about Casio Fx-991es Scientific Calculator
The calculation may be taking too long and you got impatient. To reduce the time it takes to calculate some expression or find a root you can make better guesses (initial values), or choose better limits to an integral, or divide the integral in two if integrand symmetrical. If you can select the tolerance (error you are willing to accept), increase it: Instead of taking epsilon =1E-9, take epsilon=1.E-5. But that depends on the context of the calculations. You be the judge.
Posted on Dec 21, 2013
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Posted on Jan 02, 2017
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SEC, CSC & COT are the INVERSE of COS, SIN & TAN and are usually require hitting the "2nd F" or "Func" key of the calc to make:
SIN button work as COSEC,
COS button work as SEC
TAN button work as COT
Formulas are below:
sec x = 1
cosec x = 1
cot x = 1 = cos x
tan x sin x
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