Question about Casio FX-115ES Scientific Calculator

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For get the life of me I can not figure out how to get the degree of a cos angle. For ex. cos theta = 6.5/25 = 0.26 now how do I find the degree? Shouldnt it be 2nd key + cos + 0.26 + enter? the answer should be theta = 74.92993786. help!

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When using trigonometric functions (cos, sin, tan) and their inverses (arccos, arcsin, arctan) one must be aware that the result will depend on the default angle unit : radian, degree, or grad.

Apparently you are working with the degree as the angle unit, so you must configure the calculator for that unit. (See screen capture below)
Press [SHIFT][MODE] [3:Deg]

For get the life of - 76276da.jpg

Posted on Aug 10, 2010


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theta= arctan(7.5/12)=32.00538321 or about 32 degrees.

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Get a new instruction booklet by download from TI website

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The e is the same, it is the exponential. According to Euler's relation
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