<Tr> <Th> No . </Th> <Th> Series </Th> <Th> Name </Th> <Th> Western discoverers of the series and approximate dates of discovery </Th> </Tr> <Tr> <Td> 1 </Td> <Td> sin x = x − x / 3! + x / 5! − x / 7! +...</Td> <Td> Madhava's sine series </Td> <Td> Isaac Newton (1670) and Wilhelm Leibniz (1676) </Td> </Tr> <Tr> <Td> 2 </Td> <Td> cos x = 1 − x / 2! + x / 4! − x / 6! +...</Td> <Td> Madhava's cosine series </Td> <Td> Isaac Newton (1670) and Wilhelm Leibniz (1676) </Td> </Tr> <Tr> <Td> 3 </Td> <Td> tan x = x − x / 3 + x / 5 − x / 7 +...</Td> <Td> Madhava's arctangent series </Td> <Td> James Gregory (1671) and Wilhelm Leibniz (1676) </Td> </Tr>

What is the origin of sine cosine and tangent