Question about Casio FX-7400G Plus Calculator
Posted by Anonymous on
The trigonometric function evaluations depend on the angle unit you are using: degree, radian, grad
While cos(90 deg)= 0,
cos(90 rad )=cos(90* 180/pi degrees)= -.448073616
ALWAYS CHECK UNITS before using trigonometric functions or their inverse functions.
Posted on Jul 23, 2010
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Posted on Jan 02, 2017
It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5
The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.
Hope it helps.
Posted on Sep 17, 2009
SOURCE: why the cos of 90 is -0.44... ??
The cosine of 90 radians is about -0.44, so I would say that your calculator is functioning correctly. If you must work in degrees, press SHIFT SETUP and change the angular mode.
Posted on Mar 22, 2010
Testimonial: "thanks very much yre the best"
Tips for a great answer:
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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