Arctan Calculator: Find Angle From Tangent Ratio Fast
The arctan calculator turns a tangent ratio back into the angle that produced it.
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Double Angle Calculator
Doubling an angle does not double its sine, cosine or tangent, and that single fact causes more homework errors than any other trig slip.
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Natural Log Calculator
The natural logarithm, ln(x), answers the question “to what power must e be raised to get x?” It is the logarithm with base e, about 2.71828, and it sits at the centre of calculus, continuous growth and decay.
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Interpolation Calculator
Interpolation fills in the value between measured points: give the calculator your known (x, y) pairs and a target x, and it returns the estimated y with the full working shown.
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Reverse Area Calculator
You know the area but not the shape’s measurements: a patio quoted at 64 square feet, a floor plan showing 120 square metres, a round rug sold by area alone.
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Average Rate Calculator
An average rate is trickier than it looks.
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Percentage Rate Calculator
A “percentage rate” question usually comes in one of three shapes: what percent is this part of that whole, how much did something change in percent terms, or what is the whole when you only know the part and its percent.
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T1 84 Calculator
A free TI-84-style calculator that runs right in your browser.
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Round To The Nearest Dollar Calculator
Type any amount and get the nearest whole dollar, with the deciding digit named and the same value shown under every rounding rule, so you can see why $12.50 becomes $13 while $12.49 stays $12.
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Relative Growth Rate Calculator
Relative growth rate measures growth the way nature does it: continuously, with each moment’s increase proportional to the current size.