The Answers community requires more information for this question. What is easy for some people is not easy for others so there is no single answer possible.The best thing to do is to try to understand as much as you can and seek help for the bits which you don't understand. Use sketches to help you work out what information is given and what you are required to work out. And practise.
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An easy way to learn calculus would be to take classes from an online school.
Study them.
Study hard.
If they put their mind to it, it is not difficult.
the founder thinks that how to relate the perpendicular triangle's sides.so that in that way he found the trigonometry.