Trigonometric functions are calculated using a polynomial approximation. The exact polynomial used may be different on different calculators.
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On many calculators, the MODE key/button is to set the calculator into degrees or radian angle measurment, that is, when you enter a value, it and all further values you enter will then either be understood by the calculator as a degrees or radian value for an angle.
tan114 = - 2.24604. This could easily be found by inputting the degree value into a calculator!
You can not buy an annuity value calculator. It is a tool used in the financial industry to figure out future values or fixed payments. You can use a scientific calculator to figure this out. Just key in the correct formula and you will have your answer.
Lump Sum Future Value Calculator Use this calculator to determine the future value of a lump sum.
A present value calculator is a calculator that is used to figure out the future value of something based on constant payments and interest rates. It helps to calculate the present value as well.