Question

did isaac newton invent calculus

Answer 1

 Yes, Isaac Newton and Gottfried Leibniz independently developed the theory of infinite calculus in the late 17th century. By the end of the seventeenth century, every scholar claimed that the other had stolen his work, and the debate over the Leibniz-Newton calculus continued until Leibniz's death in 1716.

Answer 2

Yes, Isaac Newton invented calculus in the mid to late 1660s, and he is best known for being the inventor of the calculus beside to Gottfried Wilhelm Leibniz.

But Leibniz had developed calculus a decade after Newton.