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Did Isaac Newton Invent Calculus?
yes
When did leibniz invent calculus?
he published his theories about calculus in 1684
When did Pascal invent calculators to help us solve taxes?
Pascal may have used some device or gadget to help do some math but he did not invent any type of calculator you are familiar with. Since tax calculations are mostly simple arithmetic and table lookups, calculators may help you do some of the math but they won't help solve taxes. Nothing can help solve taxes ;)
What reason let John Napier invent the logarithm?
There was a demand for a huge number of manual calculations to create tables - many of them for navigational purposes - where similar calculations needed to be repeated many times.
Which functions has a period?
You can invent any function, to make it periodic. Commonly used functions that are periodic include all the trigonometric functions such as sin and cos (period 2 x pi), tan (period pi). Also, when you work with complex numbers, the exponential function (period 2 x pi x i).
