Question about Texas Instruments TI-30XA Calculator
If you remember that by definition cot(theta)=1/tan(theta) your expression can be calculated as 28/tan(30). Use parentheses if necessary to enclose the whole tan(30) factor.
Before calculating any trigonometric function make sure that the angle unit is set correctly. In your case I presume that 30 means 30 degrees. Use the [DRG] key to cycle through the angle units.
Posted on Aug 23, 2010
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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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